The Federal Labor Relations Authority (FLRA) governs collective bargaining for federal employees. It was created in 1978.
Government Documents has a large collection of FLRA publications, including the following series:
Decisions (Y 3.F 31/21-3:10-4)
Federal services impasses panel releases (Y 3.F 31/21-3:14-3)
In addition, we have general publications and Congressional hearings and reports relating to the FLRA and federal labor relations.