On October 30, 1950, Pedro Albizu Campos and other nationalists led a three-day revolt against the United States in various cities and towns of Puerto Rico, in what is known as the Puerto Rican Nationalist Party Revolts of the 1950s. The most notable occurred in Jayuya and Utuado. In the Jayuya revolt, known as the "Jayuya Uprising", the Puerto Rican governor declared martial law, and attacked the insurgents in Jayuya with infantry, artillery and bombers under control of the Puerto Rican commander. The "Utuado Uprising" culminated in what is known as the Utuado massacre. Albizu Campos served many years in a federal prison in Atlanta, for seditious conspiracy to overthrow the U.S. government in Puerto Rico.