Homosexuality was illegal in Nazi Germany under a law called "Paragraph 175", which made it a felony (a "very serious" crime). About 100,000 people were arrested, with about 50,000 sent to prison. Some were sent to mental hospitals. Some were castrated (had their testicles removed). Some homosexual men were also sent to concentration camps, especially Jewish homosexuals. Between 15,000 and 600,000 homosexual men were sent to concentration camps. Most of them died there. We are not sure of the real number. Prisoners who were Jewish and homosexual may not have been counted as homosexual.