Marxism is a leftist political ideology that was founded by Karl Marx and his associate Friedrich Engels in the 19th century, advocating the proletariat's class struggle against the bourgeoisie and the upper classes. Marx hypothesized that socialism - distribution based on contribution - would lead to a society of communism, where everybody would share the world's resources and live in a utopia. Today, Marx's ideas are commonly mixed with Vladimir Lenin's beliefs in Marxism-Leninism, and his views are found in both socialist and communist organizations.