How to make elections fair?

The only candidate from the indestructible bloc of Communists and non-party. Comrade Stalin knew a lot about election fraud.  At the 17th Congress of the CPSU (b) was filed against Kirov only 3 votes, voted against Stalin's 292 delegates.  But when counting suddenly turned the other way around - 3 against Stalin (the remaining 289 votes - wiped out).  After the terror 30s need no longer rigged elections - elections have simply disappeared and turned into an absurd and meaningless ritual (99% for a single candidate from the indestructible bloc of Communists and non-party).