There was a lot of tension between the KGB and the senior party officials in the USSR. In fact, in an interview I watched recently a KGB defector described them

There was a lot of tension between the KGB and the senior party officials in the USSR. In fact, in an interview I watched recently a KGB defector described them as "hating" each other. It's not necessarily true that all KGB operatives would have been die-hard communists, particularly members of Putin's generation - i.e. those that were born and grew up in the USSR rather than actively participating in revolution.