Original Source:
https://www.thepinktriangle.com/history/symbol.html
I'm seeing this claim repeated in a few different places but I can't find a more primary source. On its face it doesn't seem like too ridiculous a claim, but on the other hand, the idea that Nazi prison guards were allowed to stick around and get paid to hold a gun and prevent these people from leaving while everybody else goes free seems incredibly questionable to me.
How did this go down, if it did? And for how long?
/u/commiespaceinvader has previously answered:
Et cetera. Someone else might write a new answer for this specific question.
Edit: Thank you to /u/Kugelfang52 for his contributions on this topic.