The story of the Nazi persecution of gay men in the 1930s and 1940s, including their imprisonment in concentration camps, where they had pink triangles sewn onto their prison uniforms. Before the rise of the Nazi party, Germany, especially Berlin, was one of the most tolerant places for homosexuals in the world. That all changed when the Nazis came to power. The pink triangle sewn onto prison uniforms became the symbol of the persecution of homosexuals, a persecution that would continue for many years after the war.