The KPD leadership initially first criticised but then supported the 1931 Prussian Landtag referendum, an unsuccessful attempt launched by the far-right Stahlhelm to bring down the social democrat state government of Prussia by means of a plebiscite; the KPD referred to the SA as “working people’s comrades” during this campaign.

In November 1932, the KPD and the Nazis worked together in the Berlin transport workers’ strike.

They had an entire organization for infiltrating unions to try to get support

The NSBO had overall little success among German organized workers, except in certain regions where they supported strikes, such as the 1932 Berlin transport strike.

Almost like exactly what I said.