On November 20 1969 who began occupation?

On November 20, 1969, a group of Native American activists began the occupation of Alcatraz Island, claiming it as a part of their rights under the Treaty of Fort Laramie. This protest, led by the Indians of All Tribes organization, aimed to highlight issues of treaty rights, sovereignty, and the treatment of Native Americans in the United States. The occupation lasted until June 11, 1971, and became a significant event in the Native American Civil Rights Movement.