Only after the decryption in the 1960s of "Venona" telegraphs from March 1940 through April 1942 was he purportedly identified as "Ivor Montagu, the well known local communist, journalist and lecturer," code name "Intelligentsia", in communications from the Soviet GRU. It should, however, be noted that the Verona decrypts, which were finally declassified in 1995, are a highly contested and confusing archive of information, with a welter of code-names, which were frequently changed and not explicitly identified with their real names; hence these decrypts were never used in any U.S. or British trials for treason, despite their availability to prosecutors from the late 1940s.