Russian-funded Facebook ads backed Stein, Sanders and Trump

The historical context is totally different though. The Communist Party of Germany (KPD) was hated by the leaders of the Social-Democratic Party of Germany (SPD), who were complicit in the murder of Rosa Luxemburg and Karl Liebknecht (the founders of the KPD) by reactionaries in 1919. Ten years later the Great Depression had broken out and the SPD was still repressing the left, e.g. violently breaking up Communist demonstrations on May Day 1929.

The Communist International, to which the KPD belonged, wrongly argued that capitalism was on its last legs and that the social-democrats were objectively worse than fascists because said social-democrats paved the way for fascism through their opposition to the left. The KPD and communist parties across the world were obliged to rigidly apply this to local conditions, e.g. US Communists attacked Upton Sinclair as a "social-fascist."

After Hitler took power and persecuted the SPD alongside the KPD and other parties, the Communists realized they had been mistaken. This led to the final 1935 congress of the Communist International, which called for popular fronts of parties against fascism, which signaled an end to the ultra-leftist line that had prevailed since 1928.

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