Re; Communists in the Nazi death camps: J. Semprun autobiographical acct. translated a few yrs. ago by either Pantheon or the New Press. Semprun was Spanish communist, wrote the creenplay for, "Z, " by Costa-Gavras, I think.
On Jewish communists, like Paul Merkur, specifically in the GDR after the war, "Divided Memory, " by Jeffery Herf. Swept up in the hysteria of '52 of the, "Doctor's Plot, ", the Slansky purge trial in Czechoslovakia, "Titoite, Zionist, Trotskyites."
On thev Russian far right, "Black Hundreds: The Rise of the Far Right in Russia, " by Walter Laqueur. Michael Pugliese