Social Mobility and Political Regimes: Intergenerational Mobility in Hungary, 1949-2017
Excellent paper dealing with the social mobility in communist regimes: the case of Hungary. Spoiler — the Soviet regime was the only major communist regime that almost totally annihilated old / traditional elites.
http://eprints.lse.ac.uk/110873/1/Working_Paper_67.pdf?fbclid=IwAR2AHOFOKj9jCv-ELs7lItkAqyBIkjZRwChRT5Uio_qFXEJIy2K7ECgH8vg