18 U.S.C. § 3601: Supervision of probation

A person who has been sentenced to probation pursuant to the provisions of subchapter B of chapter 227, or placed on probation pursuant to the provisions of chapter 403, or placed on supervised release pursuant to the provisions of section 3583, shall, during the term imposed, be supervised by a probation officer to the degree warranted by the conditions specified by the sentencing court.