On 16 December 1931, the Iron Front was founded. It was an armed partnership of the Social Democratic Party (SPD), trade unions, and other social democratic organisations. The SPD was a supporter of the republic and was fought by the communists and the Nazis. Because of the increasing violence of these parties, the SPD and its allies felt it necessary to take up arms themselves. Their logo shows three arrows pointing to the lower left inside a circle.
The Iron Front marches against the Nazis
March 1, 1932 Berlin