The notion of 'decolonization' originated with Frantz Fanon, a Caribbean born Marxist
and Critical Theorist. He emphasized ultra-violence as a cathartic means of achieving 'liberation' - a quasi-religious act of blood sacrifice, possibly inspired by voodoo. His most famous book is #The Wretched Of the Earth.'
See James Lindsay's short video, Decolonization is Violence for a brief overview.