Rosa Luxemburg's Reform or Revolution was one of the most important of her early writings. Written in 1899, it provides a devastating demolition of the theoretical and practical basis of reformism. It was completely valid at the time when it was written and it remains completely valid today. This work placed herself amongst the foremost leaders of the left of Social Democracy internationally, a role she was to occupy until her assassination in 1919.

Trotsky’s theory of the permanent revolution is one of the most important additions to the arsenal of Marxism. It was first developed by Trotsky in 1904, on the eve of the first Russian Revolution. At that time, all the tendencies of the Russian Social Democracy had the perspective of a bourgeois democratic revolution. Trotsky alone in 1905 put forward the idea that the Russian working class could come to power before the workers of Western Europe. The correctness of Trotsky’s theory was brilliantly demonstrated in 1917, when the Bolshevik Party under Lenin and Trotsky led the Russian proletariat to power in the first workers state in the world.