Cardinal Mooney's judgement of Father Coughlin was incorrect.
FDR was in fact a commie.
Archbishop of Detroit
Mooney was named the first Archbishop of Detroit, Michigan, on May 31, 1937. Upon arriving in Detroit, he was greeted by Governor Frank Murphy and a representative of Mayor Frank Couzens. An advocate for labor unions, he once proposed establishing parish labor schools in order to help "Christian workers to train themselves in principle and technique to assume the leadership in the unions which their numbers justify".
From the very beginning of his tenure in Detroit, Mooney became engaged in a contentious relationship with Fr. Charles Coughlin, whose controversial radio broadcasts had angered many in the Catholic hierarchy and American public. In October 1937, he rebuked Coughlin for casting aspersions on President Franklin Delano Roosevelt's sanity over his nomination of Hugo Black to the Supreme Court, leading Coughlin to cancel his contract for twenty-six radio broadcasts. After the priest agreed to end his program in 1942, Mooney responded, "My understanding with him is sufficiently broad and firm to exclude effectively the recurrence of any such unpleasant situation."Wiki link