> ... While most enterprises were nationalized, authorities gave permission to small-scale private workshops like his to operate

Fun story: the city of Nowy Sącz (80,000 habitants) has a very high percentage of millionaires compared to other cities. One of the reasons was that as the city is in a mountainous region hence not well communicated, the communist authorities were less strict there and allowed for private businesses to grow. As the communism ended, the region basically had a head-start compared to the rest of the country.