Many think this is a period of deterioration for USSR due to party "apparractchiks" left over from the Stalin regime wanted to return to the old status quo
"it was the right and duty of fraternal socialist countries to intervene in each others affairs when socialism was threatened"
Summary
Leonid Brezhnev came into power in 1964. During his reign, he developed such things as the Brezhnev doctrine which allowed socialist countries to intervene in each others affairs.