United States v. Mumuni, 18-1604-cr

Background

Fareed Mumuni, a U.S. citizen, pleaded guilty (no plea agreement) to conspiring and attempting to provide material support to ISIS, conspiring to assault federal officers, assaulting a federal officer with a deadly or dangerous weapon, and attempted murder of a federal officer after lunging at an unarmed FBI agent during a June 17, 2015 search with an ~8‑inch kitchen knife and (allegedly) reaching for an agent’s rifle.
At the plea hearing Mumuni expressly admitted he lunged with a knife and that he intended to kill a law‑enforcement officer; the district court accepted the plea as having an independent factual basis.
The Presentence Report produced an advisory Guidelines range of 1,020 months (85 years, capped by statutory maximums); the district court imposed a 204‑month (17‑year) aggregate sentence — an ~80% downward variance.
The Government appealed only the substantive reasonableness of the sentence. The Second Circuit majority held the sentence substantively unreasonable and remanded for resentencing.
The majority identified three principal errors: (1) the district court impermissibly second‑guessed factual findings established by Mumuni’s allocution (intent to kill and weapon lethality); (2) the court treated Mumuni more leniently than co‑defendant Saleh despite Mumuni’s more violent conduct; and (3) the court gave excessive weight to mitigating factors (youth, lack of record, disciplinary compliance) that could not justify an 80% variance.
Judge Hall concurred in part and dissented in part: he agreed the district court should clarify its apparent second‑guessing of the plea allocution but would have afforded more deference to the district court’s comparative-sentencing and mitigation assessments.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether the 17‑year sentence is substantively unreasonable given an advisory 85‑year Guidelines range	The Government: the variance (≈80%) is shockingly low given premeditated, terrorism‑motivated attempted murder and Guidelines reflecting terrorism enhancements	Mumuni: mitigating factors (youth, no prior record, disciplinary compliance, supportive letters, "suicide by cop" motive) justified a large downward variance	Court: Sentence substantively unreasonable; remand for resentencing because the reduced sentence lacked proper basis in the record
Whether the district court may revisit or contradict factual findings made during a guilty plea allocution (intent and weapon lethality)	Gov: plea allocution and evidence establish specific intent to kill and that the knife (as used) was a dangerous/deadly weapon; sentencing court may not minimize those facts	Mumuni: attack was suicide‑by‑cop/defensive in character; knife may not have been deadly in context; judge may weigh credibility at sentencing	Court: Where a court accepts a plea and allocution, it cannot make sentencing findings that contradict or minimize those admissions; if it doubts the plea, it must vacate it
Whether comparing Mumuni’s sentence to co‑defendant Saleh produced an unwarranted disparity	Gov: Mumuni’s conduct (attempted murder) was materially more serious than Saleh’s; treating them as similarly culpable was erroneous	Mumuni: emphasized lesser role, age, and non‑leadership to argue for leniency	Court: District court erred by downplaying the key distinction (Mumuni pleaded to attempted murder while Saleh did not) and by selectively using comparisons when convenient
Whether the district court improperly over‑weighted mitigating factors (age, lack of criminal history, compliance in detention) to justify a major variance	Gov: these factors do not support an 80% variance in a terrorism attempted‑murder case and institutional compliance is not a substantial mitigating factor	Mumuni: youth, immaturity, absent record, and exemplary confinement behavior are relevant mitigating evidence warranting leniency	Court: Age and lack of record insufficient to justify such a large downward variance in this terrorism context; compliance in pretrial detention is not a significant mitigating justification

Key Cases Cited

Gall v. United States, 552 U.S. 38 (2007) (district courts have broad sentencing discretion; substantial variances require explanation)
United States v. Booker, 543 U.S. 220 (2005) (Guidelines are advisory)
United States v. Cavera, 550 F.3d 180 (2d Cir. 2008) (standard for substantive‑reasonableness review and appellate weighing of sentencing factors)
United States v. Rigas, 583 F.3d 108 (2d Cir. 2009) (discussion of "shocks the conscience" standard for sentencing review)
United States v. Park, 758 F.3d 193 (2d Cir. 2014) (abuse‑of‑discretion explained; review of factual findings at sentencing)
Pepper v. United States, 562 U.S. 476 (2011) (district courts may consider post‑offense rehabilitation and background evidence)
United States v. Kwong, 14 F.3d 189 (2d Cir. 1994) (attempt to commit murder requires specific intent to kill)
United States v. Matthews, 106 F.3d 1092 (2d Cir. 1997) (weapon dangerousness depends on manner of use)
Koon v. United States, 518 U.S. 81 (1996) (sentencing judges should consider each defendant as an individual)
Miller v. Alabama, 567 U.S. 460 (2012) (youth mitigates culpability in sentencing considerations)
Montgomery v. Louisiana, 577 U.S. 190 (2016) (youth‑related principles apply retroactively)
United States v. Douglas, 713 F.3d 694 (2d Cir. 2013) (defining substantive‑reasonableness standard)
United States v. Pugh, 937 F.3d 108 (2d Cir. 2019) (sentence vacated for procedural reasons; does not preclude imposing maximum in terrorism cases when justified)