Upon the filing of a complaint, a copy of the complaint shall be served upon the respondent, and a written statement of such service shall be furnished to the District Director. [45 FR 15158, Mar. 7, 1980. Redesignated at 50 FR 31311, Aug. 1, 1985, as amended at 59 FR 15117, Mar. 31, 1994; 62 FR 6094, Feb. 10, 1997]