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51 
“(2) testified or is about to testify in any such 
proceeding, or 
“(3) assisted or participated or is about to assist 
or participate in any manner in such a proceeding or 
in any other action to carry out the purposes of this Act. 
“(b)(1) Any employee who believes that he has been 
discharged or otherwise discriminated against by any per- 
son in violation of subsection (a) of this section may, within 
sixty days after such alleged violation occurs, file (or have 
any person file on the employee’s behalf) a complaint with 
the Secretary of Labor (hereinafter in this section referred 
to as the ‘Secretary ) alleging such discharge or discrimina- 
tion. Such sixty-day period shall be tolled during the pendancy 
of any grievance procedures or other efforts at conference, 
conciliation, or mediation. Upon receipt of such a complaint, 
the Secretary shall notify the person named in the com- 
plaint of the filing of the complaint. 
“(A)(i) Upon receipt of a complaint filed under 
paragraph (1), the Secretary shall conduct an in- 
vestigation of the violation alleged in the complaint. 
Within thirty days of the receipt of such complaint, the 
Secretary shall complete such investigation and shall 
notify in writing the complainant (and any person act- 
ing with the authority of the complainant) and the per- 
son alleged to have committed such violation of the re- 
[ 721 ] 
