It won't be the most complete answer but since you have gotten no luck in replies as of yet, perhaps its better than no answer. I'm sure there will be some inaccuracies, my knowledge is mostly derived from curiosity and reading, not profound scholarly work. Hopefully is accurate enough, if it is not, then by all means provide a more accurate answer, as I would like to know too if its the case.
Long story short, Russia was the first country to have a full scale attempt at implementing Communism, during the October Revolution 1917, where the Bolsheviks seized power and led to the creation of Soviet Russia.
Why? well, it was full blown WW1 and Russia realised they were behind the times, casualties were massive and people were angry and looking for someone to blame, and someone to rally behind as it is common in such times of turmoil, and as its common in times of internal and external strife people decide each to try and grab a piece of it, so the various factions inside saw a golden opportunity to grab power.
Germany noticed this strife, and took the opportunity, they considered "Communism" to be a bit of a dangerous idea, a sort of weapon really, that would be useful in crippling enemy states due to creating mass agitation from the lower classes.
Germany thus decided to propel Russia, their enemy in the east front, into chaos using an ideological war and internal political conflict.
Germany thus smuggled Lenin, who was in exile, at the time in Switzerland due to having been part of socialist movements in Russia and 'an agitator', a prominent figure in Russia's "Russian Social Democratic Labour Party (RSDLP)" and later an author living in Western Europe, back into Russia, and financed groups in a socially/political powder keg as they knew it would end up in the collapse of the war effort, probably a lot of internal strife as well, in essence removing a huge threat.
The documents that were later revealed (post WW2) show that this was either done by or at least facilitated by Richard von Kühlmann.
Further reading: The Russian Revolution - Richard Pipes