Modern anarchism was a significant part of the worker's movement, alongside Marxism at the end of the 19th century. Modernism, industrialisation, reaction to capitalism and mass migration helped anarchism to flourish and to spread around the globe. Major schools of thought of anarchism sprouted up as anarchism grew as a social movement, particularly anarcho-collectivism, anarcho-communism, anarcho-syndicalism, and individualist anarchism. As the workers' movement grew, the divide between anarchists and Marxists grew as well. The two currents formally split at the fifth congress of the First International in 1872, and the events that followed did not help to heal the gap. Anarchists participated enthusiastically in the Russian Revolution, but as soon as the Bolsheviks established their authority, anarchists were harshly suppressed, most notably in Kronstadt and in Ukraine.