Throughout the 1990s, Ratzinger, as prefect of the CDF, continued to condemn these elements in liberation theology, and prohibited dissident priests from teaching such doctrines in the Catholic Church's name. Leonardo Boff was suspended and others were censured. Tissa Balasuriya, in Sri Lanka, was excommunicated. Sebastian Kappen, an Indian theologian, was also censured for his book "Jesus and Freedom". Under Ratzinger's influence, theological formation schools were forbidden from using the Catholic Church's organization and grounds to teach unacceptable Marxist ideas from liberation theology.