The Guam Organic Act of 1950, (48 U.S.C. § 1421 et seq., Pub. L. 81–630, H.R. 7273, 64 Stat. 384, enacted August 1, 1950) is a United States federal law that redesignated the island of Guam as an unincorporated territory of the United States, established executive, legislative, and judicial branches, and transferred federal jurisdiction from the United States Navy to the United States Department of the Interior. For the first time in over three hundred years of foreign colonization, the people of Guam had some measure of self-governance, however limited. Before that time there was some participation in the Local Administration, through the mayors or "gobernadorcillos" in Spanish times, who acted under the supervision of the Governor of the Mariana Islands.[1]