Sisters of Perpetual indulgence at Manchester Pride Festival parade, 36 Whitworth Street, Manchester, England, UK, M1 3NR

The Sisters of Perpetual Indulgence (SPI), also called Order of Perpetual Indulgence (OPI), is a charitable, protest, and street performance movement that uses drag and religious imagery to satirize issues of sex, gender, and morality (particularly Christian perspectives on these topics) and fundraise for charity. In 1979, a small group of gay men in San Francisco began wearing the attire of Catholic nuns in visible situations using camp to promote various social and political causes in the Castro District. From the original organization in San Francisco, the Sisters have grown throughout the U.S., Canada, Australia, Europe, and South America, and are now an international network of autonomous orders. These orders are mostly registered as non-profit charity organizations that raise money for AIDS, LGBT-related causes, and mainstream community service organizations, while promoting safer sex and educating others about the harmful effects of drug use and other high risk behaviors. They have also protested many Christian, and specifically Catholic, events perceived as anti-LGBT, including the visit of Pope John Paul II to the United States. Throughout the movement's history there have been a number of conflicts with Christian communities. The group has been characterized by some Catholics (such as the Catholic League for Religious and Civil Rights) as anti-Catholic and a hate-group for impersonating and mocking Catholic practices and beliefs, including religious sisters