NSDAP posters often dared the German left to attend Party gatherings using familiar symbology that had been the preserve of the left such as the color red. Hitler was quite open both in Mein Kampf and his own interviews that this was trying to court violence and cause a stir. As he would claim in the 1920s:

It makes no difference whatever whether they laugh at us or revile us, whether they represent us as clowns or criminals; the main thing is that they mention us, that they concern themselves with us again and again.