delivered the opinion of the Court.
We granted certiorari to by the Court of Appeals in setting aside a determination of the Board of Immigration Appeals (BIA). The BIA ruled that respondent, a native and citizen of Guatemala, was not entitled to withholding of deportation based on his expressed fear of persecution for earlier political activities in Guatemala. The issue in the case is not whether the persecution is likely to occur, but whether, even assuming it is, respondent is ineligible for withholding because he “committed a serious nonpolitical crime” before his entry into the United States. 8 U. S. C. § 1253(h)(2)(C). The beginning point for the BIA’s analysis was its determination that respondent, to protest certain governmental policies in Guatemala, had burned buses, assaulted passengers, and vandalized and destroyed property in private shops, after forcing customers out. These actions, the BIA concluded, were serious nonpolitical crimes. In reaching this conclusion, it relied on a statutory interpretation adopted in one of its earlier decisions,
Matter of McMullen,
19 I.
&
N. Dec. 90 (BIA 1984), aff’d,
On appeal, the concluded the BIA had applied an incorrect interpretation of the serious nonpolitieal crime provision, and it remanded for further proceedings. In the Court of Appeals’ view, as we understand it, the BIA erred by misconstruing the controlling statute and by employing an analytical framework insufficient to take account of the Court of Appeals’ own precedent on this subject. According to the court, the BIA erred in failing to consider certain factors, including “the political necessity and success of Aguirre’s methods”; whether his acts were grossly out of proportion to their objective or were atrocious; and the persecution respondent might suffer upon return to Guatemala.
*419
We granted certiorari.
I
The statutory provision for withholding of deportation that is applicable here provides that “[t]he Attorney General shall not deport or return any alien ... to a country if the Attorney General determines that such alien’s life or freedom would be threatened in such country on account of race, religion, nationality, membership in a particular social group, or political opinion.” 8 U. S. C. § 1253(h)(1). The provision was added to the Immigration and Nationality Act (INA), 66 Stat. 166, 8 U. S. C. § 1101
et seq.
(1994 ed. and Supp. III), by the Refugee Act of 1980 (Refugee Act), Pub. L. 96-212, 94 Stat. 102. See INS v.
Stevic,
“there are serious reasons for considering that the alien has committed a serious nonpolitieal crime outside the United States prior to the arrival of the alien in the United States.” 8 U. S. C. § 1253(h)(2)(C).
Under the immigration laws, withholding is distinct from asylum, although the two forms of relief serve similar purposes. Whereas withholding only bars deporting an alien to a particular country or countries, a grant of asylum permits an alien to remain in the United States and to apply for permanent residency after one year. See
INS
v. Cardoza-
*420
Fonseca,
As an incidental point, we gration Reform and Immigrant Responsibility Act of 1996 (IIRIRA), Pub. L. 104-208, 110 Stat. 3009-546,. Congress revised the withholding and asylum provisions. The withholding provisions are now codified at 8 U. S. C. § 1231(b)(3) (1994 ed., Supp. III), and the asylum provisions at §1158. Under current law, as enacted by IIRIRA, the Attorney General may not grant asylum if she determines “there are serious reasons for believing that the alien has committed a serious nonpolitical crime outside the United States prior to the arrival of the alien in the United States.” § 1158(b)(2)(A)(III). The parties agree IIRIRA does not govern respondent’s case. See IIRIRA, Tit. Ill-A, §§ 309(a), (c), 110 Stat. 3009-625; IIRIRA, Div. C, Tit. VI-A, § 604(c), 110 Stat. 3009-692. Prior to IIRIRA, in the Antiterrorism and Effective Death Penalty Act of 1996 (AEDPA), Pub. L. 104-132, Tit. IV-B, § 413(f), 110 Stat. 1269, Congress granted the Attorney General discretion to withhold deportation when necessary to ensure compliance with the international treaty upon which the Refugee Act was based, see infra, at 427-429. This provision was made applicable to “applications filed before, on, or after” April 24,1996, “if final action has not been taken on them before such date.” AEDPA § 413(g), 110 Stat. 1269-1270. The BIA’s decision constituted final action when rendered on March 5, 1996, 8 CFR § 243.1 (1995), App. to Pet. for Cert. 12a, so AEDPA § 413(f) was not applicable to respondent’s case.
*421 We turn to the matter before us. In 1994, respondent was charged with deportability by the Immigration and Naturalization Service (INS) for illegal entry into the United States. Respondent conceded deportability but applied for asylum and withholding. At a hearing before an Immigration Judge respondent testified, through an interpreter, that he had been politically active in Guatemala from 1989 to 1992 with a student group called Estudeante Syndicado (ES) and with the National Central Union political party. App. 19-20, 36-37. He testified about threats due to his political activity. The threats, he believed, were from different quarters, including the Guatemalan Government, right-wing government support groups, and left-wing guerillas. App. to Pet. for Cert. 23a.
Respondent described activities he and other ES members engaged in to protest various government policies and actions, including the high cost of bus fares and the government’s failure to investigate the disappearance or murder of students and others. App. 20-21; App. to Pet. for Cert. 22a-23a. For purposes of our review, we assume that the amount of bus fares is an important political and social issue in Guatemala. We are advised that bus fare represents a significant portion of many Guatemalans’ annual living expense, and a rise in fares may impose substantial economic hardship. See Brief for Massachusetts Law Reform Institute et al. as Amicus Curiae 18-19. In addition, government involvement with fare increases, and other aspects of the transportation system, has been a focus of political discontent in that country. Id., at 16-21.
record, respondent testified that he and his fellow members would “strike” by “burning buses, breaking windows or just attacking the police, police cars.” App. 20. Respondent estimated that he participated in setting about 10 buses on fire, after dousing them with gasoline. Id., at 46. Before setting fire to the buses, he and his group would order passengers to leave *422 the bus. Passengers who refused were stoned, hit with sticks, or bound with ropes. Id., at 46-47. In addition, respondent testified that he and his group “would break the windows of... stores,” “t[ake] the people out of the stores that were there,” and “throw everything on the floor.” Id., at 48.
The Immigration Judge for withholding of deportation and for asylum, finding a likelihood of persecution for his political opinions and activities if he was returned to Guatemala. App. to Pet. for Cert. 31a-32a. The INS appealed to the BIA. Respondent did not file a brief with the BIA, although his request for an extension of time to do so was granted. Brief for Petitioner 10, n. 6; Record 13-15. The BIA sustained the INS's appeal from this decision, vacated the Immigration Judge’s order, and ordered respondent deported. App. to Pet. for Cert. 18a. With respect to withholding, the BIA did not decide whether respondent had established the requisite risk of persecution because it determined that, in any event, he had committed a serious nonpolitical crime within the meaning of § 1253(h)(2)(C).
In addressing the BIA applied the interpretation it first set forth in Matter of McMullen, 19 I. & N. Dee., at 97-98: “In evaluating the political nature of a crime, we consider it important that the political aspect of the offense outweigh its common-law character. This would not be the ease if the crime is grossly out of proportion to the political objective or if it involves acts of an atrocious nature.” In the instant case, the BIA found, “the criminal nature of the respondent’s acts outweigh their political nature.” App. to Pet. for Cert. 18a. The BIA acknowledged respondent’s dissatisfaction with the Guatemalan Government’s “seeming inaction in the investigation of student deaths and in its raising of student bus fares.” Ibid. It said, however: “The ire of the ES manifested itself disproportionately in the destruction of property and *423 assaults on civilians. Although the ES had a political agenda, those goals were outweighed by their criminal strategy of strikes ...Ibid. The BIA further concluded respondent should not be granted discretionary asylum relief in light of “the nature of his acts against innocent Guatemalans.” Id., at 17a.
A divided panel of the Court of Appeals granted respondent’s petition for review and remanded to the BIA.
view, “[t]he BIA correctly identified the legal question, whether ‘the criminal nature of the respondent’s acts outweigh their political nature.’ ”
Id.,
at 524 (quoting
McMullen
v.
INS,
II
an matter, the Court of Appeals expressed no disagreement with the Attorney General or the BIA that the phrase “serious nonpolitical crime” in § 1253(h)(2)(C) should be applied by weighing “the political nature” of an act against its “common-law” or “criminal” character. See
Mat
*424
ter of McMullen, supra,
at 97-98; App. to Pet. for Cert. 18a;
Deportation Proceedings for Doherty,
13 Op. Off. Legal Counsel 1,23 (1989) (an act “‘should be considered a serious nonpolitieal crime if the act is disproportionate to the objective’ ”) (quoting
McMullen
v.
INS, supra,
at 595), rev’d on other grounds,
Doherty
v.
INS,
The Court of Appeals BIA must supplement this weighing test by examining additional factors. In the course of its analysis, the Court of Appeals failed to accord the required level of deference to the interpretation of the serious nonpolitical crime exception adopted by the Attorney General and BIA. Because the Court of Appeals confronted questions implicating “an agency’s construction of the statute which it administers,” the court should have applied the principles of deference described in
Chevron U. S. A. Inc.
v.
Natural Resources Defense Council, Inc.,
It is clear that principles of
Chevron
ble to this statutory scheme. The INA provides that “[t]he Attorney General shall be charged with the administration and enforcement” of the statute and that the “determination and ruling by the Attorney General with respect to all questions of law shall be controlling.” 8 U. S. C. § 1103(a)(1) (1994 ed., Supp. III). Section 1253(h), moreover, in express terms confers decisionmaking authority on the Attorney General, making an alien’s entitlement to withholding turn on the Attorney General’s “determinEation]” whether the statutory conditions for withholding have been
*425
met. 8 U. S. C. §§ 1253(h)(1), (2). In addition, we have recognized that judicial deference to the Executive Branch is especially appropriate in the immigration context where officials “exercise especially sensitive political functions that implicate questions of foreign relations.”
INS
v.
Abudu,
General, while retaining ultimate authority, has vested the BIA with power to exercise the “discretion and authority conferred upon the Attorney General by law” in the course of “considering and determining cases before it.” 8 CFR § 3.1(d)(1) (1998). Based on this allocation of authority, we recognized in
Cardoza-Fonseca, supra,
that the BIA should be accorded
Chevron
deference as it gives ambiguous statutory terms “concrete meaning through a process of case-by-case adjudication” (though we ultimately concluded that the agency^ interpretation in that case was not sustainable).
A
The Court of Appeals’ error is clearest with respect to its holding that the BIA was required to balance respondent’s criminal acts against the risk of persecution he would face if returned to Guatemala. In Matter of Rodriguez-Coto, 19 I. & N. Dec. 208, 209-210 (1985), the BIA “rejected] any interpretation of the phras[e] . . . ‘serious nonpolitieal crime’ in [§ 1253(h)(2)(C)] which would vary with the nature of evidence of persecution.” The -text and structure of § 1253(h) are consistent with this conclusion. Indeed, its *426 words suggest that the BIA’s reading of the statute, not the interpretation adopted by the Court of Appeals, is the more appropriate one. As a matter of plain language, it is not obvious that an already-completed crime is somehow rendered less serious by considering the further circumstance that the alien may be subject to persecution if returned to his home country. See ibid. (“We find that the modifiejr]... ‘serious’... relate[s] only to the nature of the crime itself”).
It is important, too, as at 209-210, that for aliens to be eligible for withholding at all, the statute requires a finding that their “life or freedom would be threatened in [the country to which deportation is sought] on account of their race, religion, nationality, membership in a particular social group, or political opinion,” i. e., that the alien is at risk of persecution in that country. 8 U. S. C. § 1258(h)(1). By its terms, the statute thus requires independent consideration of the risk of persecution facing the alien before granting withholding. It is reasonable to decide, as the BIA has done, that this factor can be considered on its own and not also as a factor in determining whether the crime itself is a serious, nonpolitical crime. Though the BIA in the instant case declined to make findings respecting the risk of persecution facing respondent, App. to Pet. for Cert. 18a, this was because it determined respondent was barred from withholding under the serious nonpolitical crime exception. Ibid. The BIA, in effect, found respondent ineligible for withholding even on the assumption he could establish a threat of persecution. This approach is consistent with the language and purposes of the statute.
In reaching the contrary risk of persecution should be balanced against the alien’s criminal acts, the Court of Appeals relied on a passage from the Office of the United Nations High Commissioner for Refugees, Handbook on Procedures and Criteria for Determining Refugee Status (Geneva, 1979) (U. N. Handbook).
*427
We agree the U. N. Handbook provides some guidance in construing the provisions added to the INA by the Refugee Act.
INS
v.
Cardoza-Fonseca,
N. Handbook may be a useful interpretative aid, but it is not binding on the Attorney General, the BIA, or United States courts. “Indeed, the Handbook itself dis
*428
claims such force, explaining that ‘the determination of refugee status under the 1951 Convention and the 1967 Protocol ... is incumbent upon the Contracting State in whose territory the refugee finds himself/ ”
INS
v.
Cardoza-Fonseca,
B
Also relying on the U. N. Handbook, the Court of Appeals held that the BIA “should have considered whether the acts committed were ‘grossly out of proportion to the alleged objective/ . . . The political nature of the offenses would be ‘more difficult to accept’ if they involved ‘acts of an atrocious nature/ ”
not understand the BIA to dispute that these considerations — gross disproportionality, atrociousness, and comparisons with previous decided cases — may be important in applying the serious nonpolitical crime exception. In fact, by the terms of the BIA’s test (which is similar to the language quoted by the Court of Appeals from the U. N. Handbook), gross disproportion and atrociousness are relevant in the determination. According to the BIA: “In evaluating the political nature of a crime, we consider it important that the political aspect of the offense outweigh its common-law character. This would not be the case if the crime is grossly out of proportion to the political objective or if it involves acts of an atrocious nature.”
Matter of
McMullen, 19 I. & N. Dec., at 97-98. See also
Deportation Proceedings for Doherty,
13 Op. Off. Legal Counsel, at 22-26, rev’d on other grounds,
Doherty
v.
INS,
The BIA’s does not equate every serious nonpolitical crime with atrocious acts. Cf. 8 U. S. C. § 1253(h)(2)(B) (establishing an exception to withholding for a dangerous alien who has been convicted of a “particularly serious crime,” defined to include an “aggravated felony”). Nor is there any reason to find this equivalence under the statute. In common usage, the word “atrocious” suggests a deed more culpable and aggravated than a serious one. See Webster’s Third New International Dictionary 139 (1971) (defining “atrocious” as, “marked by or given to extreme wickedness . . . [or] extreme brutality or cruelty”; “outrageous: violating the bounds of common decency”; “marked by extreme violence: savagely fierce: murderous”; “utterly revolting: abominable”). As a practical matter, if atrocious acts were deemed a necessary element of all serious nonpolitical crimes, the Attorney General would have severe restrictions upon her power to deport aliens who had engaged in serious, though not atrocious, forms of criminal activity. These restrictions cannot be discerned in the text of § 1253(h), and the Attorney General and BIA are not bound to impose the restrictions on .themselves.
*431 In the instant case, the BIA determined that “the criminal nature of the respondent’s acts outweigh their political nature” because his group’s political dissatisfaction “manifested itself disproportionately in the destruction of property and assaults on civilians” and its political goals “were outweighed by [the group’s] criminal strategy of strikes.” App. to Pet. for Cert. 18a. The BIA concluded respondent had committed serious nonpolitical crimes by applying the general standard established in its prior decision, so it had no need to consider whether his acts might also have been atrocious. The Court of Appeals erred in holding otherwise.
of Appeals’ suggestion that reversal was required due to the BIA’s failure to compare the facts of this case with those of McMullen. The court thought doing so was necessary because of the guidance provided by McMullen on the meaning of atroeiousness. In light of our holding that the BIA was not required expressly to consider the atrociousness of respondent’s acts, the BIA’s silence on this point does not provide a ground for reversal.
C
The third reason given by the Court of Appeals for reversing the BIA was what the court deemed to be the BIA’s failure to consider respondent’s “offenses in relation to [his] declared political objectives” and to consider “the political necessity and success of [his] methods.”
*432
It is true the Attorney General has suggested that a crime will not be deemed political unless there is a “‘close and direct causal link between the crime committed and its alleged political purpose and object.’ ”
Deportation Proceedings for Doherty,
18 Op. Off. Legal Counsel, at 28 (quoting
McMullen
v.
INS,
f — 1
Finally, respondent contends before the Immigration Judge contains errors. He testified in Spanish and now contends there are errors in translation and transcription. Brief for Respondent 11-22. Respondent advanced this argument for the first time in his Brief in Opposition to Certiorari in this Court, see Brief in Opposition 1-5, having failed to raise it before either the BIA or the Court of Appeals. We decline to address the argument at this late stage.
*433 Respondent has filed a motion in the BIA for a new hearing in light of the alleged errors. App. to Brief for Respondent la-6a. Should the BIA determine modification of the record is necessary, it can determine-whether further consideration of the withholding issue is warranted.
* * *
The reasons given by the Court of Appeals for reversing the BIA do not withstand scrutiny. We reverse the judgment of the Court of Appeals and remand the case for further proceedings consistent with this opinion.
It is so ordered.
