Апрельские тезисы
In his April Theses, Lenin denounced the war as an imperialist conflict, and urged workers worldwide to use it as an occasion for proletarian revolution. The Second International dissolved during the war, while Lenin, Trotsky, Karl Liebknecht and Rosa Luxemburg, together with a small number of other Marxists opposed to the war, came together in the Zimmerwald Conference in September 1915.