You might also be interested in the book “I led 3 Lives: Citizen, Communist, Counterspy” by Herbert Philbrick.
Similar situation. He infiltrated a communist cell for the FBI. Later testified against them, as he actually got promoted very high up the commie food chain in the USA.
He said many organizations in the USA were actually communist front groups, such as the ACLU.
I’ve seen the book but never have read it.
I’ve seen a few episodes of the tv show.
The threat remains and it is violent and malignant.
It was a TV series back in the ‘50s. When the TV networks at least appeared to be on our side.