The following links from the Department of Interior provide an overview of labor law in Federal agencies.

Labor Relations

DOI Labor Relations Program Representational Proceedings Management Rights Employee Rights Arbitration Official Time Labor-Management Cooperation

Federal Labor Relations Bargining Unit Representational Rights of the Union Negotiations Contract Administration Interest Based Bargaining Unfair Labor Practices Negotiated Grievance Procedures Merit Systems Protection Board

Information on the Federal Labor Relations Authority can be accessed here.