The defendant was found guilty by a jury of the crime of robbery in the second degree, in violation of General Statutes § 53a-135 (a) (2). He was sentenced to a term of not less than five nor more than ten years’ imprisonment, and the sole issue presented on appeal is the constitutionality of General Statutes § 53a-35 (c) (2) (B), 1 which requires that persons convicted of second degree robbery be sentenced to a five-year minimum term which cannot be suspended or reduced. The defendant argues that this statute is an impermissible usurpation of the judicial power by the legislature, in violation of the separation of powers provisions of the federal and state constitutions. TJ. S. Const., arts. II, III, IV, V; Conn. Const., arts. II, V. We find no such constitutional infirmity.
It is well settled that a party who challenges a statute on constitutional grounds has no easy burden, for every intendment will be made in favor of constitutionality, and invalidity must be established beyond a reasonable doubt.
Lublin
v.
Brown,
In assessing the constitutionality of the challenged statute, the following observation by Mr. Justice Frankfurter of the Hnited States Supreme
*679
Court is cogent: “Whatever views may be entertained regarding severity of punishment, whether one believes in its efficacy or its futility, . . . these are peculiarly questions of legislative policy.”
Gore
v.
United States,
A statute can overstep constitutional hounds if it represents an effort by the legislature to exercise a power which lies exclusively under the control of the courts;
State
v.
Clemente,
It is rudimentary that the three branches of government do not exist in discrete, airtight compartments, and that the rule of separation of governmental powers cannot always he rigidly applied.
Adams
v.
Rubinow,
supra, 155. In this context it must he remembered that the constitution assigns to the legislature the power to enact laws defining crimes and fixing the degree and method of punish
*680
ment and to the judiciary the power to' try offenses under these laws and impose punishment within the limits and according to the methods therein provided. See
Ex Parte United States,
In other words, the judiciary’s power to impose a particular sentence is defined by the legislature, and there is no constitutional requirement that courts be given discretion in imposing a sentence. See, e.g.,
Dodd
v.
Martin,
The challenged statute is a valid exercise of the legislature’s police power, which clearly encompasses the preservation of order and the prevention of crimes and misdemeanors. “To he constitutionally valid, a regulation made under the police power must have a reasonable relation to the public health, safety, morality and welfare.”
State
v.
Gordon,
It is clear that General Statutes § 53a-35 (c) (2) (B) passes constitutional muster under this standard. There is a rational relationship between the protection of public safety and the imposition of a nonsuspendable sentence for the violent crime *681 of second degree robbery, an essential element of which is the threatened nse of a deadly weapon or dangerous instrument. General Statutes § 53a-135 (a) (2). A statute establishing a mandatory jail sentence not only punishes perpetrators of violent crimes but it may also have a deterrent effect, which is a valid social purpose properly within the legislature’s police power. State v. Gordon, supra.
Other state courts which have considered the question have upheld mandatory sentences. See, e.g.,
People
v.
Broadie,
supra; see also
People
v.
Alotis,
For these reasons we are unconvinced that the legislature has unduly impinged upon the powers of the judiciary. The defendant relies heavily upon three California Supreme Court cases in which that court invalidated statutes requiring the trial court to gain approval of the district attorney before it could (1) strike prior convictions of persons who would otherwise be sentenced as second offenders;
People
v.
Tenorio,
*682 We find these authorities unpersuasive when applied to the present case. The California statutes contained a broad grant of discretion to the trial court, but the exercise of that discretion was conditioned upon the prosecutor’s approval. Plainly, statutes of that sort are distinct from a statute imposing a mandatory sentence because, in the latter instance, the broad grant of discretion was never given to the judiciary by the legislature. If the statute involved here required the trial court to gain the state’s attorney’s approval before imposing a certain sentence, then this line of cases might be persuasive, but we cannot find them controlling in the actual circumstances of the present case.
The defendant also argues that a mandatory sentencing statute unconstitutionally delegates judicial power to the state’s attorney because the latter could choose to prosecute for a crime which carries a mandatory sentence instead of for a crime which carries no such penalty.
This argument is unpersuasive and, when applied to the present facts, is at best hypothetical. A state’s attorney has great responsibility and broad discretion with respect to selecting an appropriate charge. That power, however, is limited in the usual and lawful manner by the facts which the prosecutor may be reasonably expected to prove at trial.
People
v.
Eboli,
Accordingly, we conclude that General Statutes § 53a-35 (c) (2) (B) is an appropriate exercise of the legislature’s police power and is not an unconstitutional violation of the separation of powers doctrine.
There is no error.
In this opinion the other judges concurred.
Notes
General Statutes § 53a-35 (e) (2) (B) entitled, “Imprisonment for felony: Indeterminate; maximum and minimum sentences,” provides in pertinent part: “[W]lien a person is found guilty under section . . . 53a-135 (a) (2), the minimum term shall be not less than five years and such sentence shall not be suspended or reduced.”
Such a judicial invalidation is most likely to occur if the challenged statute is cruel and unusual punishment, in violation of the eighth amendment to the United States constitution. See, e.g.,
Weems
v.
United States,
