Title: De Mgr Lefebvre à Mgr Williamson
Subjects: History, Catholic traditionalist movement, Conservatism, Religious aspects, Catholic Church, Integralismus, Action française, Fraternité sacerdotale internationale saint Pie X (Ecône), Priesterbruderschaft Sankt Pius X.
People: Marcel Lefebvre (1905-1991), Richard Williamson (1940-)
Time periods: 20th century