In 1933, Archbishop John McNicholas composed a membership pledge for the Legion, which read in part:
I wish to join the Legion of Decency, which condemns vile and unwholesome moving pictures. I unite with all who protest against them as a grave menace to youth, to home life, to country and to religion. I condemn absolutely those salacious motion pictures which, with other degrading agencies, are corrupting public morals and promoting a sex mania in our land. … Considering these evils, I hereby promise to remain away from all motion pictures except those which do not offend decency and Christian morality.
The pledge was revised in 1934:
I condemn all indecent and immoral motion pictures, and those which glorify crime or criminals. I promise to do all that I can to strengthen public opinion against the production of indecent and immoral films, and to unite with all who protest against them. I acknowledge my obligation to form a right conscience about pictures that are dangerous to my moral life. I pledge myself to remain away from them. I promise, further, to stay away altogether from places of amusement which show them as a matter of policy.
In 1938, the league requested that the Pledge of the Legion of Decency be administered each year on the Feast of the Immaculate Conception (December 8).