Guevara's life had many ironies. For one thing, this Communist came from an upper-class background: his parents were Argentinian aristocrats (his father was an officer of a yacht-building company!). For another, he was a Marxist long before Castro. Fidel made him Minister of Economics, and he turned the Cuban economy into a Marxist mess well before Castro "came out" as a Marxist. Guevara waged unsuccessful guerilla actions in the Congo before going to Bolivia, where he was betrayed by a CIA agent, shot, and turned into an international martyr.
Castro wasn't exactly a proletarian, either: his father was the biggest privatge landowner in Oriente Province--the sweat of his canecutters paid for Fidel's education at Cuba's finest private schools. His first wife was the daughter of one of Cuba's wealthiest families--and Fulgencio Batista, the dictator that Castro later overthrew, gave the happy couple a $1,000 cash gift as their wedding present. They blew it, and $10k more that her father gave them, on a lavish honeymoon in the US in 1948--Castro bought a new Lincoln Connie to take him and his bride around Miami and NY.