15 Again, every Mexican citizen who is engaged in the education of children or of youth, or holds any public office whatsoever, has been ordered to make known publicly whether he accepts the policies of the President and approves of the war which is now being waged on the Catholic Church. The majority of these same individuals were forced, under threat of losing their positions, to take part, together with the army and laboring men, in a parade sponsored by the Regional Confederation of the Workingmen of Mexico, a socialist organization. This parade took place in Mexico City and in other towns of the Republic on the same day. It was followed by impious speeches to the populace. The whole procedure was organized to obtain, by means of these public outcries and the applause of those who took part in it, and by heaping all kinds of abuse on the Church, popular approval of the acts of the President.
Source: Iniquis Afflictisque (Vatican.va)