A mix of unemployment through an entire year (2013), already having similar personal standards, and my aunt marrying a Russian (ironically, he's now far-right) who said he missed the USSR and how life was there. Also, one of my former bosses gave me a copy of The Communist Manifesto and I liked it. Then I read the first The Capital volume. I suppose it was a gradual proccess and somewhat instinctive in my case - I basically figured out Communism is, logically, the best possible system for people like me.