AC meaning in International ?

Catholic Action was the name of many groups of lay Catholics who were attempting to encourage a Catholic influence on society. They were especially active in the nineteenth century in historically Catholic countries that fell under anti-clerical regimes such as Spain, Italy, Bavaria, France, and Belgium. Adolf Hitler ordered the murder of Erich Klausener, head of a Catholic Action group in Nazi Germany, during the Night of the Long Knives. Catholic Action is not a political party in and of itself; however, in many times and places, this distinction has become blurred. Since World War II the concept has often been eclipsed by Christian Democrat parties that were organised to combat Communist parties and promote Catholic social justice principles in places such as Italy and West Germany.

Catholic Action generally included various subgroups for youth, women, workers, etc. In the postwar period, the various national Catholic Action organizations for workers formed the World Movement of Christian Workers, which remains highly active today as a voice within the Church and in society for working class Catholics.