RFB, was a German paramilitary organization affiliated with the Communist Party of Germany during the Weimar Republic
https://en.wikipedia.org/wiki/Roter_Frontk%C3%A4mpferbund
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The idea that led to the creation of a Front of anti-imperialist class forces is, of course, not new. The experiences behind the struggles of antifascist people’s Fronts of the 20th century, with Thälmann’s Rot Front in the foreground, are well-known.
On the whole, this idea comes from a conclusive deductive call out of the Manifesto of the Communist Party “Workers of the world, unite!” In Russia, during all the years of the war against capitalism, starting at the times of Gorbachev, the question of uniting the left forces always stood on the agenda and was being decided in a variety of ways: Coordination Committees were active, party leaders held meetings, headquarters and diverse alliances were being created. In some cases cooperation functioned, in other cases it did not.
https://leftrussia.wordpress.com/2016/08/14/history-of-rot-front/