What is the US Policy to resist the spread of Communism?

Originally the USA was against a "Democracy" and described it as naked communism pre-1933/1934. In 1934 FDR stopped the publication of "The Manual on Citizenship Training" that gave this description, there was no official order (on record) to destroy all these books but that is what was done, as such; only 6 known copies of this book are known to still exist (1 at the Library of Congress, 4 at Fort Mead, 1 at the University of Texas) - several PDF (Electronic copies) are available on the internet. FDR then began to promote the USA as a Democracy which contradicts its original establishment as a Republic, and his "Big Deal" programs (socialist programs) to the American public.

Then a set of 'laws' and 'acts' related to this, generally termed as "McCarthyism" and a host of acts came out of those times (1940 - present day).

The Smith Act: was mostly non-effective, and already present in law, so it has / had no real effect to anyone (still in full force).

The Internal Security Act (ISA) / Subversive Activities Control Act / McCarran Act or any combination of these laws made it unlawful to have a communist origination unless it was registered with the USA; passed 1950, ruled unconstitutional in 1965 / 1967.

The Communist Control Act of 1954 was an extension of the original ISA and ruled unconstitutional, as part of the rulings, 1965 / 1967.

Under a strict definition of the original terms of Communism (given by Karl Marx, 10 planks of Communism) the USA today meets all requirements of Communism, including the socialist programs (in most parts).