AHC: Communist Japan BEFORE WWII

With a POD prior to 1937 (I'm counting the start of the Second Sino-Japanese War as the beginning of WWII) how can Japan become a communist state? Of course a communist Japan would butterfly WWII as we know it, but that's fine. Bonus points if the "Japanese Revolution" is homegrown and not imposed by a foreign power i.e. the Soviets invading and setting up a puppet government. I'll allow POD's prior to 1900 as long as most of the butterflies flap post 1900.
 
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Well, the Japanese Communist Party was founded in 1922. However, there was a Socialist Party founded in 1906 which collapsed into infighting within two years. Maybe if they stayed united they could grow larger and more successful.
 
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