Who enforced catholic doctrine?

Catholic doctrine has historically been enforced by the Magisterium, which comprises the Pope and the bishops in communion with him. This ecclesiastical authority interprets and teaches the faith, ensuring adherence to church teachings. Additionally, the Inquisition played a significant role in enforcing doctrine, particularly during the Middle Ages and the Renaissance, by investigating and prosecuting heresy. Over time, various councils and synods have also contributed to the clarification and enforcement of Catholic doctrine.