Thesis advisor: Thomas E. Wangler / The story of the transformation of St. Benedict Center in Cambridge, Massachusetts, originally a small Catholic student center, into a controversial and socially disruptive religious community is little known today even by most Bostonians. Some sixty-five years ago, however, the Center's public activities under the leadership of its chaplain, Leonard Feeney, S.J., were the focus of intense controversy and publicity, nationally and internationally as well as locally. In the 1940s, there was no clear theological consensus on the possibility of salvation for non-Catholics. Although there seems to have been a notable hesitation on the part of theologians and hierarchy alike in Boston to issue an official pronouncement on the Church's theology of salvation, there was at the same time an unhesitating consensus among them that Fr. Feeney's rigorist interpretation of the Catholic doctrine extra ecclesiam nulla salus ("no salvation outside the Church") was not that of the Church in the modern age. Complex social and cultural factors were at play in the controversy. Ultimately, though, any historian attempting to make sense of the ideas and actions of Fr. Feeney and the members of the Center is confronted with the fact that they took theology seriously, and so also must the historian who hopes to understand them. My thesis in this dissertation is that a uniquely explosive combination of theological developments, social flux, and intersecting personalities led to the eruptions at St. Benedict Center. / Thesis (PhD) — Boston College, 2014. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Theology.