On January 30th 1933, the day Hitler was declared chancellor, the communist KPD asked the Iron Front, the social democrat SPD, the general trade union association ADGB and their organisations, and Reichsbanner Schwarz-Rot-Gold to declare a general strike against Hitler. The Iron Front declined and issued a call on February 2nd to "all comrades of the Reichsbanner and the Iron Front", warning against participating in "wild actions organised by irresponsible people", and exhorted members to "turn all Iron Front events into powerful rallies for freedom".
and how'd that go?