Kurt Ernst Carl Schumacher was a German social democratic politician, who served as chairman of the Social Democratic Party of Germany from 1946 and was the first Leader of the Opposition in the West German Bundestag from 1949 until his death. An opponent of Chancellor Konrad Adenauer's government, but an even stronger opponent of the East German Socialist Unity Party and communism in general, he was one of the founding fathers of post-war German democracy. He was also a noted opponent of the far-right and the far-left, i.e. the Nazi Party and the Communist Party of Germany, during the Weimar Republic, and is famous for his description of the communists as "red-painted Nazis." He spent over ten years in Nazi concentration camps, where he was severely mistreated.

https://en.wikipedia.org/wiki/Kurt_Schumacher