It worked in urban areas to ensure civil rights for American Indians, as well as to educate people about their cultural and spiritual heritage.

Bellecourt was present briefly during the 1973 Wounded Knee occupation at Pine Ridge Indian Reservation in South Dakota.

After Wounded Knee, Bellecourt worked with the International Indian Treaty Council, which advocates on behalf of indigenous rights throughout the Western Hemisphere.

[6] Bellecourt was active for many years in the campaign to free AIM activist Leonard Peltier, who was convicted in 1977 of killing two FBI agents during a 1975 shootout on the Pine Ridge Reservation.

During the 1997 World Series Bellecourt was arrested for setting fire to a stuffed doll of Chief Wahoo while protesting outside of Jacobs Field.

In August 2007, Bellecourt accepted an invitation from the Venezuelan government to attend the First International Congress of Anti-imperialist Indigenous Peoples of America.