As historian Dariusz Stola notes, the anti-Jewish campaign combined century-old conspiracy theories, recycled antisemitic claims and classic communist propaganda. Regarding the tailoring of the "Żydokomuna" sentiment to communist Poland, Stola suggested: Paradoxically, probably the most powerful slogan of the communist propaganda in March was the accusation that the Jews were zealous communists. They were blamed for a major part, if not all, of the crimes and horrors of the Stalinist period. The myth of Judeo-Bolshevism had been well known in Poland since the Russian revolution and the Polish-Bolshevik war of 1920, yet its 1968 model deserves interest as a tool of communist propaganda. This accusation exploited and developed the popular stereotype of Jewish communism to purify communism: the Jews were the dark side of communism; what was wrong in communism was due to them.