11 But you, venerable brethren, who know the origin and the drift of these gathering evils, strive with all your force of soul to implant the Catholic teaching deep in the minds of all. Strive that all may have the habit of clinging to God with filial love and revering His divinity from their tenderest years; that they may respect the majesty of princes and of laws; that they may restrain their passions and stand fast by the order which God has established in civil and domestic society. Moreover, labor hard that the children of the Catholic Church neither join nor favor in any way whatsoever this abominable sect; let them show, on the contrary, by noble deeds and right dealing in all things, how well and happily human society would hold together were each member to shine as an example of right doing and of virtue. In fine, as the recruits of socialism are especially sought among artisans and workmen, who, tired, perhaps, of labor, are more easily allured by the hope of riches and the promise of wealth, it is well to encourage societies of artisans and workmen which, constituted under the guardianship of religion, may tend to make all associates contented with their lot and move them to a quiet and peaceful life.
Source: Quod Apostolici Muneris (Vatican.va)