Why Weimar Republic are called november criminals?And what are Catholics and Democrats?

The first world war had a devastating impact on the entire Europe both psychologically and financially. From a continent of creditors, Europe turned into one of debtors. Unfortunately, the infant Weimar Republic was being made to pay for the sins of the old empire. The republic carried the burden of war guilt and national humiliation and was financially crippled by being forced to pay compensation. Those who supported the Weimar Republic, mainly Socialists, Catholics and Democrats, became easy targets of attack in the conservative nationalist circles. They were mockingly called the November criminals.