Don't write it all off as the work of conspiracy nutz.
Fatima mentions the errors of communism will spread worldwide. Fatima is Church approved and its hard to write off Sr. Lucy as a conspiracy theorist.
I always assumed she meant outside of the church. Certainly to some extent the church may have been contaminated by communist ideas, particularly in the poorer countries.
If I've met any communists in the church, they sure have fooled me.
Or the Blessed Virgin Mary.