you're politically imagining a historical record that doesn't exist. Comintern required adherence to 'social fascist' argument, KPD broke unions, and KPD chair Ernst Thālmann said “don’t overestimate the Fascist danger–it was Hitler’s best day” after communist & nazi streetfights affected elections.

Two years later, the KPD aligned with nazis in parliament & sowing discord in the streets to give Hitler an even better day. Throughout the 1930s, the NKVD handed antifascists to the nazis. but yes, Comintern belatedly embraced popular fronts, while also purging members for not being committed. cool