Yeah, that's where the pink triangle for homosexuals came from.
The history of the pink triangle begins before WWII, during Adolf Hitler's rise to power. Paragraph 175, a clause in German law prohibiting homosexual relations, was revised by Hitler in 1935 to include kissing, embracing, and gay fantasies as well as sexual acts. Convicted offenders -- an estimated 25,000 just from 1937 to 1939 -- were sent to prison and then later to concentration camps. Their sen-tence was to be sterilized, and this was most often accomplished by castration. In 1942 Hitler's punish-ment for homosexuality was extended to death.
Each prisoner in the concentration camps wore a coloured inverted triangle to designate their reason for incarceration, and hence the designation also served to form a sort of social hierarchy among the prisoners. A green triangle marked its wearer as a regular criminal; a red triangle denoted a political prisoner. Two yellow triangles overlapping to form a Star of David designated a Jewish prisoner. The pink triangle was for homosexuals. A yellow Star of David under a superimposed pink triangle marked the low-est of all prisoners - a gay Jew.
Stories of the camps depict homosexual prisoners being given the worst tasks and labours. Pink tri-angle prisoners were also a proportionally large focus of attacks from the guards and even other inmates. Although the total number of the homo-sexual prisoners is not known, official Nazi estimates were an underwhelming 10,000.
Although homosexual prisoners reportedly were not shipped en masse to the death camps at Auschwitz, a great number of gay men were among the non-Jews who were killed there. Estimates of the number of gay men killed during the Nazi regime range from 50,000 to twice that figure. When the war was finally over, countless many homosexuals remained prisoners in the camps, because Paragraph 175 remained law in West Germany until its repeal in 1969.