Until early 1940, the largest group of inmates consisted of German, Austrian and Czechoslovak socialists, communists, homosexuals, anarchists and people of Romani origin. Other groups of people to be persecuted solely on religious grounds were the "Sectarians", as they were dubbed by the Nazi regime, meaning Bible Students, or as they are called today, Jehovah's Witnesses. The reason for their imprisonment was their rejection of giving the loyalty oath to Hitler and their refusal to participate in any kind of military service.