A coalition of unions have challenged the Department of Homeland Security for unlawful termination of a negotiated union contract that protects nearly 47,000 Transportation Security Officers (TSOs). Plaintiffs argue that this action violates the constitutional rights of federal employees and undermines collective bargaining protections. They further argue that this action is retaliation against the plaintiffs for exercising First Amendment rights to advocate on behalf of federal workers, and that the action violates the Fifth Amendment by stripping TSA workers of vested property rights without due process.