Vladimir Lenin
In 1907 he traveled around Europe again, and visited many socialist meetings and events. During World War I he lived in big European cities like London, Paris and Geneva. At the beginning of the war, a big left-wing meeting called the Second International included the Bolsheviks. The meeting shut down when a lot of the groups argued whether or not to support the war. Lenin and the Bolsheviks were one of only a few groups who were against the war because of their Marxist ideas.