Who paid Lenin?

I was intrigued by title of 2004 year documentary “Who paid Lenin?” I thought why? for what? I found out things I never heard about.
Two main persons in documentary: Russian revolutionary Lenin and a man called Alexander Parvus (born as Israel Lazarevich Gelfand).
 
Lenin and Parvus (Wikipedia.com)
At Wikipedia`s article about Lenin, Parvus and facts shown in [...]