It was when Khrushchev took over that the economy began to sink. My understanding was that the Soviet economy actually boomed from the mid 50s to the late 60s

It was when Khrushchev took over that the economy began to sink. My understanding was that the Soviet economy actually boomed from the mid 50s to the late 60s (Khruschev's tenure from 1953-1964) -- but that once Brezhnev took over, that's when it started hitting the brakes.