"Moscow's Assault on the Vatican"

According to this piece by Ion Mihai, "[t]he Soviet Union was never comfortable living in the same world with the Vatican. The most recent disclosures document that the Kremlin was prepared to go to any lengths to counter the Catholic Church’s strong anti-Communism."  More specifically, Mihai contends that the infamous 1963 play by Roch Hochhuth, The Deputy, which inaugurated the re-working of Pope Pius XII by the press from a heroic friend of the Jews to a heartless accomplice to the Holocaust, was the outgrowth of KGB efforts to undermine the Holy See's moral authority.

If this is true . . . wow.  Will anyone investigate?