Religious ceremonies were an inseparable part of Aboriginal traditional life, reinforcing social, economic and political values. However, missionaries and government officials with ethnocentric attitudes of cultural superiority decreed that Native dances and ceremonies were immoral or un-Christian and an impediment to the integration of the Native population into Canadian society. Beginning in 1885, the Department of Indian Affairs implemented a series of amendments to the Canadian Indian Act designed to eliminate traditional forms of religious expression and customs, such as the Sun Dance, the Midewiwin, the Sweat Lodge and giveaway ceremonies. However, the amendments were only partially effective. Aboriginal resistance to the laws took many forms; community leaders challenged the legitimacy of the terms and the manner in which the regulations were implemented, and they altered their ceremonies - the times and locations, the practices - in an attempt both to avoid detection and to placate the agents who enforced the law. Katherine Pettipas views the amendments as part of official support for the destruction of indigenous cultural systems. She presents a critical analysis of the administrative policies and considers the effects of government suppression of traditional religious activities on the whole spectrum of Aboriginal life, focusing on the experiences of the Plains Cree from the mid-1800s to 1951, when regulations pertaining to religious practices were removed from the Act. She shows how the destructive effects of the legislation are still felt in Aboriginal communities today, and offers insight to current issues of Aboriginal spirituality, including access to and use of religious objects held in museum repositories, protection of sacred lands and sites, and the right to indigenous religious practices in prison.