18 USC 3581 - Sentence of imprisonment

(a) In General.— 
A defendant who has been found guilty of an offense may be sentenced to a term of imprisonment.
(b) Authorized Terms.— 
The authorized terms of imprisonment are
(1) for a Class A felony, the duration of the defendants life or any period of time;
(2) for a Class B felony, not more than twenty-five years;

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(3) for a Class C felony, not more than twelve years;
(4) for a Class D felony, not more than six years;
(5) for a Class E felony, not more than three years;
(6) for a Class A misdemeanor, not more than one year;
(7) for a Class B misdemeanor, not more than six months;
(8) for a Class C misdemeanor, not more than thirty days; and
(9) for an infraction, not more than five days.