Verified Answer :

Do you mean the Hungarian Revolution of 1956?

At this time, Hungary was controlled and de-facto occupied by the Soviet Union. There were no free elections and all the decisions in the country had to be approved by the Soviets.

The Hungarian revolution was a protest against that. The main demand was free elections.

  • - Facts about the Hungarian Revolution in 1956.
    - - Taken over by the "de-facto"
    - - Controlled by the Soviet Union
    - - Every single decision (like laws, nature destruction etc) had to be approved by the Soviets. 
    - - Some other things were
    -Khrushchev's rule of the de-Stalinisation
    -Russian was the ones who controlled the economy.
    - Hungary was poor
    -Very little freedom
    -
    Hungary was given to the Soviets
    These are some causes that sparked the 
    Hungarian Revolution.

    ~Hope this helps