There is a serious study published just a few years ago, titled “Törvényes” Megszállás, by the Hungarian National Archives. It is basically a compilation of the official letters sent around by the administration in that era.

Here is a link so you can purchase the book if you are actually interested, it’s in Hungarian though, full of archaic 1945-contemporary phrases:

https://www.libri.hu/konyv/l_balogh_beni.torvenyes-megszallas.html

Widespread rapes happening is not and never was a disputed fact, not even by the occupiers. In fact, the Stalinist leader of the Hungarian Communist Party was petitioning Stalin to rein in his soldiers, as the atrocities committed by the Red Army were weakening his election chances. The Budapest Council after its establishment at the start of the occupation had its first order of business to make abortion legal and free, temporarily.

There is indeed a discussion on how many rapes happened, but the low number admitted by the authorities back then is 50 thousand victims, with many of them being raped multiple times, just in the capital. The reconstructed number from official descriptions that were never collated during the occupation is 200 thousand, meaning more than a third of all women living there. Other missives from doctors in Budapest complain about that it’s not just that they were overwhelmed by the wave of female patients who were seriously injured from the violence inflicted upon them, but that there was a wave of fungal infections following the rape wave, which was then followed by a wave of syphilis patients, as symptoms became apparent. Syphilis medicine was in short supply, as the Red Army confiscated most of it to treat their own men.

This wasn’t confined to Budapest either, on Nagyszékely, the local doctor reported that 60% of the female population had an STD, aged from 16 to 78. On Kecskemét, the (Soviet-installed) mayor reports 193 civilians were murdered by Red Army soldiers in half a year, and people were unwilling to do any overtime since they wouldn’t leave their families alone after dark. The mayor also complains of a notable uptick in suicides specifically among men unable to cope with their daughters or wives being raped and murdered.

There was also widespread robbery. The train on which the attendees of the Congress of Civil Engineers were travelling back home was robbed, to the point that they even took their clothes away from around 50 people. The Pest county Union Secretary has been robbed of his bike by Russians three times in a row. Red Army troops were going around the countryside, confiscating carts and horses from peasants working their fields.

And then there was the Malenkij Robot, which had, similarly to when the German occupation rounded up Jews and took them away to death camps, this time it was the Soviet occupation rounding up Germans to take them away to death camps. There are widespread reports of them not being selective, in Vencsellő, the Russian lieutenant ordered everyone between 16 and 45 rounded up, threatening the local council secretary with summary execution if they missed even one person.

All in all, 300 thousand people died in forced labour camps.

So, fuck Russia.