http://www.slate.com/articles/news_and_politics/history/2015/09/holocaust_history_misunderstood_it_has_provided_moral_cover_for_the_wars.html

The cantor is a vivid presence in any Jewish congregation, responsible for song, often a man with an outgoing personality and a sense of social engagement. Such a cantor was Eleazar Bernstein, who lived with his wife Martha and their three children in the southwestern German city of Zweibrücken in the 1930s. Among other good deeds, Bernstein would visit Jews in the local prison to lift their spirits. There he befriended a guard, a police captain named Kurt Trimborn, with whom he would play chess.