The American Indian Movement flag flies over a camp of tipis at Wounded Knee, South Dakota. Photograph by Jon Lurie, 1998. Used with the permission of Jon Lurie.

Clyde Bellecourt addresses the twenty-five-year commemoration of the AIM occupation of Wounded Knee, South Dakota. Photograph by Jon Lurie, 1998. Used with the permission of Jon Lurie.

Clyde Bellecourt (left) and Dennis Banks (right) field calls from reporters at Pine Ridge Tribal Headquarters. Photograph by Jon Lurie, 1998. Used with the permission of Jon Lurie.

American Indian Movement (AIM) button from the AIM powwow held at the Minneapolis American Indian Center, December 29, 1990.

American Indian Movement (AIM) button from the AIM powwow at the Minneapolis American Indian Center, December 29, 1990.

Tipi with American Indian Movement (AIM) sign on the grounds of the Washington Monument, Washington, DC, during the "Longest Walk" (1978). Original in the US New & World Report collection in the Library of Congress’s prints and photographs division.

American Indian Movement (AIM) protest button from Wounded Knee, 1974.

Flag of the American Indian Movement (AIM). Image by Wikimedia Commons user Tripodero, January 6, 2018.

American Indian Movement (AIM) members singing the AIM song, mid-1970s. From What Now, People? Vol. 2, Paredon Records, 1977.