Catholic Subject Headings, a list of subject headings focused on describing and representing Catholic belief, ritual, and culture, was first published in 1942 by the Catholic Library Association for use in Catholic libraries. The creation of a cataloging tool solely to represent and serve a distinct religious population allows for an imposition of religious worldview by those utilizing Catholic Subject Headings onto the materials they interacted with. The need for a specifically Catholic cataloging system is also revealing of the complex tensions between Catholics and Protestants and within the American Catholic community in twentieth century America.