Syndicalism is defined by the concepts of revolutionary spontaneity and direct action - the belief that the workers themselves, organized in labour unions, must combat capitalism, instead of relying upon an external agent such as a political party. Though Syndicalism is divided between various currents, some of them influenced by other ideologies such as Marxism and Anarchism, orthodox Syndicalism is based upon the works of the leaders of Confédération Générale du Travail (CGT), codified in the Charter of Amiens of 1906, and considers Mikhail Bakunin and Pierre-Joseph Proudhon to be its forerunners. Syndicalism is the leading left-wing revolutionary ideology whose rise to worldwide prominence began with the French revolution of 1919.