During World War I, people wanted a better world to live in, and communism seemed to promise that. A revolution started by the Bolsheviks to overthrow capitalism in Russia begun, inspired by the theories of Karl Marx. The revolution's leader, Lenin, urged workers to join their revolution. They made trade, commerce and private property criminal acts. Lenin abolished free markets, and the government began controlling wages and prices, but that did not go well. He knew he needed to change this, so he implemented a new policy to revive the economy, where farmers can manage their own businesses, and small businesses can operate. After Lenin passed away, the Soviet leader, Stalin, introduced central planning.