Yes, absolutely. Soviets spied on their satellites and satellites spied on disunity within Soviet ranks to ensure what policy to follow. Czechoslovakia in 1960 repatriate Soviets that were tied to previous Stalinist government. Than president Novotny had an excellent relationship with Khrushchev, but was unhappy when people who were not friendly to his regime operated there so they were forced to leave. The first communist president Gottwald had a mental breakdown when he discovered an listening device in his office. Nobody in Czechoslovakia was in the peak of the Red Terror able to explain it and all pointed out to USSR. Gottwald started to drink heavily after this episode. In late 60s when Czechoslovakia undergo through political crisis culminating with a Soviet invasion in 1968, the country was full of Eastern Block spies. The Czechoslovak press even outed and caused a huge problem for Soviet led change of regime. It was believed that Konev visited Prague in 1968 under pretext to establish a new pro-Soviet government. This incident was later a cause why Prague removed his statue. Pretty much, through 50s-80s, comrades were spying on each other and were very careful what they said.