A Socialist International women’s conference in Copenhagen in 1910 launched International Women’s Day globally in 1911. Trotskyist parties, including the predecessor organization of Socialist Action / Ligue pour l’Action socialiste in the Canadian state, re-launched the modern IWD in 1978. For good reason.
Women’s oppression is rooted in the capitalist system. As with heterosexism, racism, environmental destruction and war, capitalism profits from discrimination, dispossession and plunder.