2 C.F.R. § 180.120

Portions of subparts A through I (see table at § 180.100(b)) apply to you if you are a:

(a) Person who has been, is, or may reasonably be expected to be, a participant or principal in a covered transaction;

(b) Respondent (a person against whom a Federal agency has initiated a debarment for suspension action);

(c) Federal agency debarring or suspending official; or

(d) Federal agency official who is authorized to enter into covered transactions with non-Federal parties.