immunity from legal proceedings

A ballot will not give a union statutory immunity from legal proceedings if industrial action is called by a person not specified or described on the voting paper.

It also reiterated that the Compensation Commission and escrow account enjoy all privileges and rights of the United Nations, including immunity from legal proceedings.

What redress would the Baron have if the Spanish State simply declared the works of art to be Spanish patrimony, as it is a principle of public international law that a Sovereign state enjoys immunity from legal proceedings abroad?