Problems of political reform:
Lenin and Stalin system: centralised party and state control over regional USSR parties, party obeyed politburo.
Khrushchev: Reforms threated CP control in Hungary and Poland
Brezhnev: No meaningful reform, No attempts democratise government. BUT suppressed political dissidents.
Andropov: Continued Brezhnev policy suppression, allowed Increased political freedoms in party socially and economically. Wanted deal with Long term probs (econ decline and corruption). Promoted those willing question system to senior positions such as Gorbachev.