What were the political reasons for disintegration of Soviet Union?

Explanation

(i) The Communist Party of Soviet Union had ruled for over 70 years but it was not accountable to people. (ii) Ordinary people had been alienated and were exempted from enjoying the privileges and to participate actively in political affairs. (iii) Due to slow and stifling administration, the inability of system to correct mistakes lost popular support. (iv) The centralisation of authority in vast land.