Opposition to World War I

Opposition to World War I was widespread during the conflict and included socialists, such as anarchists, syndicalists, and Marxists, as well as Christian pacifists, anti-colonial nationalists, feminists, intellectuals, and the working class. The socialist movement had declared before the war their opposition to a war which they said could only mean workers killing each other in the interests of their bosses.

Source: Wikipedia — Opposition to World War I (CC BY-SA 4.0)