Maria Duce (Latin for With Mary as our Leader) was a small Catholic Integrist group active in Ireland, founded in 1942 by Fr Denis Fahey.[1][2]
The most notable exception was Fr Denis Fahey who founded an extreme right-wing social movement known as Maria Duce ('under Mary's leadership') in the mid-1940s. Maria Duce contained only a small cadres of members (though it was able to attract large crowds to its public meetings) and its appeal was mainly limited to the discontented lower middle classes.
Maria Duce was probably the most integralist movement in Ireland in that period. At this stage a definition of what is meant by integralism. Whereas Christian Fundamentalism is defined as "the belief that everything in the Bible is completely true" (Collins Dictionary), integralism is the belief that faith can only be lived out in an integral way, which means that the Church is expected to teach its precepts integrally and does not depart from them under any circumstance, and the faithful have to respect those precepts fully. À la carte Catholicism, in other words, is not an option.