Starting to read John Howard Yoder's Politics of Jesus already on the first page in the first note I am referred to books and authors I have not heard of, such as John Pairman Brown with The liberated zone, dated 1969.
Apparently there has been a tendency towards what is generally called liberation theology in the Anglophone world, earlier than might have been thought.
A review of this book from 1970 - you can enlarge the text to read it by clicking on it.