 The American Indian Movement and the Native American Church (peyote religion) both also hold a negative view of Thanksgiving; the AIM has used it as a platform for protest, most notably when they took over a "Mayflower" float in a Thanksgiving Day parade.Some Native Americans hold "Unthanksgiving Day" celebrations in which they mourn the deaths of their ancestors, fast, dance, and pray.This tradition has been taking place since 1975.