What factors contributed to the establishment of a totalitarian regime in the USSR?

Several important factors contributed to the establishment of a totalitarian regime in the USSR. The most important thing was that there was no opinion of the people, or rather, no one asked the people. The second factor is the total superiority of the ruling party, or rather, it was only one. Another important factor was the charismatic leader at the head of state. The crisis of religion and science also played an important role. And the growth of ideology on the part of the authorities played a decisive role. The structure of traditional society has also been changed.