 Contemporary Christian missionaries try to observe the principles of inculturation in their missionary work.In the 1970s, the Jesuits would become a main proponent of the liberation theology which openly supported anti-imperialist movements.It was officially condemned in 1984 and in 1986 by then-Cardinal Ratzinger (later Pope Benedict XVI) as the head of the Congregation for the Doctrine of the Faith, under charges of Marxist tendencies, while Leonardo Boff was suspended.