A Union of American Seamen Was Peacefully Picketing a Foreign

Essay

A union of American seamen was peacefully picketing a foreign ship operated entirely by a foreign crew under foreign articles while temporarily in an American port. They were protesting against loss of livelihood by American seamen to foreign flagships with substandard wages or substandard conditions and in order to prevent the foreign ship from unloading its foreign cargo in the American port. Does the federal court have the power to issue injunctions in the above case?