Based socialist revolt against authoritarianism.

I like this summary from https://communist.red/the-1956-hungarian-revolution-a-struggle-for-genuine-socialism/

Here we republish an extract from the new introduction to Peter Fryer’s ‘Hungarian Tragedy’, by General Secretary of the RCP, Ben Gliniecki. This begins our series of articles to commemorate the Hungarian people’s noble and valiant struggle for genuine socialism.

Seventy years ago, in October 1956, Hungarians flooded into the streets. For eleven days, they fought the Stalinist dictatorship. By the end, they were battling Soviet tanks street by street. This was a revolution for genuine socialism in Hungary.

The Hungarian regime was hated. It was socialist in name but bureaucratic in essence – modelled on the Soviet Union under strict control by Moscow. This lifeless government had been bureaucratically deformed ever since its birth in 1949. But it was rocked in 1956 by a living movement for workers’ democracy against Stalinist repression. Contrary to Stalinist slanders, this was never a movement for the restoration of capitalism. It was an attempt by ordinary Hungarians to take control over their own lives and establish a healthy socialist society.

The revolution was ultimately crushed with an iron fist and Soviet tanks. The scale of the threat it posed to the Soviet bureaucracy can be measured in the lives that were lost. Tens of thousands of Hungarian workers were killed and countless more injured.