All you have to do is read what Bella Dodd said during her testimony in front of the House Committee on Un-American affairs when she not only admitted that she was personally responsible for convincing a staggering number of card and non-card carrying members of the Communist Party to join the seminaries in the 1930's and 1940's, but she was also responsible for getting 300+ teachers into the schools that were -all- card-carrying Communists.
The plot, in her own words, "You won't even recognize the Catholic religion." They wanted to create a "pseudo Church" to take the place of the Catholic Church, in stealth, because it was the -only- viable opponent of Communism. Of course. Our Lord and Our Lady are -the only opponents- that can withstand Satan.