"The promised Land" (https://www.imdb.com/title/tt0072446): a film set during the rapid development of textile industry in XIX century Łódź, where fortunes could be made relatively quickly.
"Camouflage" (legal link with Eng subtitles: https://www.youtube.com/watch?v=ciGr-hi9He4): a story of a PhD student entering the corrupted science world of communist Poland. Relevant to basically anyone who has to function within a corrupted institution (which makes all of us?).
"The structure of crystal" (legal link with Eng subtitles: https://www.youtube.com/watch?v=qozV9J8bVA0): similar to the previous one (same director), but this time the young PhD student explores more philosophical questions.
There's plenty more of great stuff if one wants to explore (Kieślowski, Wajda, Zanussi, the whole movement of "cinema of moral anxiety"), Polish cinema during communism was really prolific for some reason.