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.

[5] Writing in the pacifist magazine Peace News, playwright R. H. Ward praised De Ligt as "the Gandhi of the West".

The Conquest of Violence: An Essay on War and Revolution is a book written by De Ligt which deals with non-violent resistance in part inspired by the ideas of Gandhi,[6] and details his rejection of antisemitism, militarism, imperialism, capitalism, fascism and Bolshevism.

[7] The Conquest of Violence drew on British philosopher Gerald Heard's idea that human aggression had become "a useless evil" with the advent of industrialized warfare.