10 For by particularly subtle activity an association has been created among you to which has been attached the title of "patriotic," and Catholics are being forced by every means to take part in it. This association - as has often been proclaimed - was formed ostensibly to join the clergy and the faithful in love of their religion and their country, with these objectives in view: that they might foster patriotic sentiments; that they might advance the cause of international peace; that they might accept that species of socialism which has been introduced among you and, having accepted it, support and spread it; that, finally, they might actively cooperate with civil authorities in defending what they describe as political and religious freedom. And yet - despite these sweeping generalizations about defense of peace and the fatherland, which can certainly deceive the unsuspecting - it is perfectly clear that this association is simply an attempt to execute certain well defined and ruinous policies.
Source: Ad Apostolorum Principis (Vatican.va)