25 We have exposed the errors and the violent, deceptive tactics of bolshevistic and atheistic Communism. It is now time, Venerable Brethren, to contrast with it the true notion, already familiar to you, of the civitas humana or human society, as taught by reason and Revelation through the mouth of the Church, Magistra Gentium .
Source: Divini Redemptoris (Vatican.va)