Social justice is that form of justice which impels men to promote the common good; that is, the welfare of the community as such, as a unified entity, and also the common good as comprising the welfare of all members of society. This was the meaning attached to the term by Pope Pius XI. In Atheistic Communism he declared: “It is impossible to care for the social organism and the good of society as a unit unless each single part and each individual member… is supplied with all that is necessary for the exercise of his social functions.”