“On April 8, 1952, Dodd rejoined the Roman Catholic Church at Saint Patrick's Cathedral, New York City, after taking weekly instruction from Monsignor Fulton J. Sheen (whose converts also included Louis F. Budenz and Clare Booth Luce).
“She became an outspoken proponent for the Catholic Church and a vocal anti-communist, warning against the ‘materialistic philosophy’ which guided public education, demoralized Americans, and formed the basis of both Communism and National Socialism.” [slightly edited to improve sentence structure]
Jargon: a mole is a long-term spy. The individual is recruited before he or she has access to the intelligence sought. Subsequently, the operative manages to get into the target organization and begins the assignment(s).
Are there any moles inside the Catholic Church today? Of course. On average and roughly speaking, out of every nine people you meet, two are Catholic.