Analysis of information sources in references of the Wikipedia article "Venona project" in English language version.
Meredith Gardner kept his British counterpart abreast of developments, and from 1948 on there was complete and profitable US-UK cooperation on the problem. The control term "Venona" did not appear on the translated messages until 1961. In the beginning the information was usually called the "Gardner material," and a formal control term "Bride" was finally affixed in 1950. From the late 1950s to 1961 the control term was "Drug".
The Venona messages clearly display Julius Rosenberg's role as the leader of a productive ring of Soviet spies...they confirm that she [Ethel] was a participant in her husband's espionage and in the recruitment of her brother for atomic espionage. But they suggest that she was essentially an accessory to her husband's activity, having knowledge of it and assisting him but not acting as a principal.
Meredith Gardner kept his British counterpart abreast of developments, and from 1948 on there was complete and profitable US-UK cooperation on the problem. The control term "Venona" did not appear on the translated messages until 1961. In the beginning the information was usually called the "Gardner material," and a formal control term "Bride" was finally affixed in 1950. From the late 1950s to 1961 the control term was "Drug".