I must admit that Sarant had the makings of an undercover agent; he was a cautious young man, yet full of resolve, with progressive ideas.
In turn, he recruited Sarant and the two shared an apartment and were allowed to function as a team by their KGB Case Officer, Alexander Feklisov.
Barr worked for a while in late 1946 with Sperry Gyroscope Company on secret military radar systems, but was fired in 1947 after the United States Air Force refused him a security clearance.
Barr disappeared from his Paris apartment the day after David Greenglass was arrested, and fled to Czechoslovakia without taking his belongings.
In 1956, the two transferred to Leningrad and were put at the head of a military electronics research institute, and enjoyed the benefits of the Soviet nomenklatura.
In May 1962, Soviet Premier Nikita Khrushchev toured their institute and agreed to their plan to establish a new city dedicated entirely to microelectronics.
Barr and Sarant lost their positions at Zelenograd when Khrushchev was deposed, but they continued to work on military projects, including the Uzel fire-control computer that was installed in Tango and Kilo submarines.