Christian Cagigal, I have read the article in Wikipedia. This is not a reliable source as anyone can write the articles. It is restricted even by Wikioedia. However even the article suggest it is not a genuine charity but
claiming that while they perform fundraising and other community activities, they do it in the spirit of anti-Catholicism. Catholic League president William A. Donohue states, "It is ludicrous on the face of it for the Sisters to maintain that one of the major issues they address is 'the role of religion in daily life.
Their attempts to disrupt Catholic services and their support only for certain charities indicate its main aim is to attack the Catholic Church The article does say the Sisters of Perpetual Indulgence (SPI) is also called the Order of Pepetual Indulgence in Australia and elsewhere is a charity, protest and street performance organization that uses drag to call attention to sexual intolerence and to satirize issues of gender and morality.
Aparently the US Constitution does allow this group to operate. However at least your political leaders like Clinton refuse to attend a gay rights march because of the presence of this group. Aparently our leaders were not so aware.