; and of which not to exceed $1,500 shall be available for official reception and representation expenses: Provided , That public members of the Federal Service Impasses Panel may be paid travel expenses and per diem in lieu of subsistence as authorized by law ( 5 U.S.C. 5703 ) for persons employed intermittently in the Government service, and compensation as authorized by 5 U.S.C. 3109: Provided further , That, notwithstanding 31 U.S.C. 3302 , funds received from fees charged to non-Federal participants at labor-management relations conferences shall be credited to and merged with this account, to be available without further appropriation for the costs of carrying out these conferences. Federal Trade Commission salaries and expenses For necessary expenses of the Federal Trade Commission, including uniforms or allowances therefor, as authorized by 5 U.S.C. 5901–5902 ; services as authorized by 5 U.S.C. 3109 ; hire of passenger motor vehicles