Presents the history of revolutionary thought and the birth of socialism, from the French Revolution and the 1824 rediscovery by Jules Michelet of the ideas of Italian political philosopher Giovanni Vico about the perfectibility of man, through the 19th-century collaboration of Marx and Engels, to the 1917 arrival of Vladimir Lenin at Finland Station, Saint Petersburg, to lead the Bolsheviks in the Russian Revolution. --Adapted from Wikipedia.