The Occupation of Alcatraz was a 19-month long protest when 89 Native Americans and their supporters occupied Alcatraz Island. Wikipedia

An occupation of Alcatraz Island by 89 American Indians and supporters, whose group chose the name Indians of All Tribes, seeking to reclaim the island under the US honor the Treaty of Fort Laramie between the U.S. and the Lakota, which stated all retired, abandoned or out-of-use federal land was returned to the Native people who once occupied it Wikipedia Disambiguation

Native American protest in 1969 - 1971 Wikidata