 However, De Ligt became sceptical about the League's efforts, viewing it as how the colonial powers maintained an unjust world order.De Ligt instead regarded the Brussels Congress Against Colonial Oppression and Imperialism, held in 1927 as more representative of the world's population.At a meeting of the War Resisters International in 1934, he presented his now-famous "Plan of a Campaign Against All Wars and Preparation for War".