The pink triangle was established as a pro-gay symbol by activists in the United States during the 1970s. Its precedent lay in World War II, when known homosexuals in Nazi concentration camps were forced to wear inverted pink triangle badges as identifiers, much in the same manner that Jews were forced to wear the yellow Star of David. Wearers of the pink triangle were considered at the bottom of the camp social system and subjected to particularly harsh maltreatment and degradation. Thus, the appropriation of the symbol of the pink triangle, usually turned upright rather than inverted, was a conscious attempt to transform a symbol of humiliation into one of solidarity and resistance. By the outset of the AIDS epidemic, it was well-entrenched as a symbol of gay pride and liberation.