There are authorized to be appropriated in each fiscal year such sums as may be necessary for the following:
(1) District of Columbia Pretrial Services Agency.
(2) Supervision of offenders on probation, parole, or supervised release for offenses under the District of Columbia Official Code.
(3) Operation of the parole system for offenders convicted of offenses under the District of Columbia Official Code.
(4) Operation of the Trusteeship described in § 24-132.