Firmissimam Constantiam §31

³¹ Thus a Catholic will take care not to pass over his right to vote when the good of the Church or of the country requires it. Thus there will be avoided the danger of seeing Catholics, in the exercise of their civil and political activities, organizing in particular groups, at times disputing among themselves or also contrary to the directions of the ecclesiastical authorities. That would be increasing the confusion and scattering the forces, to the complete detriment both of the development of Catholic Action and of the very cause that they wish to defend.