"In September 1974, the FBI received a letter [from Philip K. Dick]. The accusations in the letter were shocking – it told of a communist conspiracy aimed at the hearts and minds of America through propaganda in the subtle guise of science fiction. Major science-fiction publishers and organisations had been infiltrated, and their agents, notable figures in the genre, were abroad in the West. The orchestrator of it all was a communist committee, acting under the name... Stanisław Lem."
PKD on the other hand (as mentioned in the OP) did not like Lem.
https://culture.pl/en/article/philip-k-dick-stanislaw-lem-is...
"In September 1974, the FBI received a letter [from Philip K. Dick]. The accusations in the letter were shocking – it told of a communist conspiracy aimed at the hearts and minds of America through propaganda in the subtle guise of science fiction. Major science-fiction publishers and organisations had been infiltrated, and their agents, notable figures in the genre, were abroad in the West. The orchestrator of it all was a communist committee, acting under the name... Stanisław Lem."