State immunity — Jurisdictional immunity — Dispute concerning contract of employment — French national employed as laboratory technician under fixed-term contract by United States Department of Agriculture — Claim against United States for unlawful termination of contract — Whether United States enjoying jurisdictional immunity from proceedings instituted before municipal courts — Test of whether employment activities carried out within the framework of public service functions

State responsibility — For breaches of contractual obligation — Termination of employment contract — Whether force majeure where funding of programme not renewed by Congress — Whether provision entitling United States to terminate contract in such circumstances is contrary to public policy (ordre public) — The law of France