• Hands over the City by Francesco Rosi. Generally anything by Rosi is great—for those who love The Battle of Algiers, he was going to direct that film if Pontecorvo passed—but I think this is his strongest film that displays the pure corruption involved in city development in post-WWII Italy.
• Bicycle Thieves by Vittorio De Sica is the quintessential workers drama about how the average worker gets screwed over again and again. De Sica made sure his actors were actual workers, and the movie itself is wonderful.
• The Organizer by Mario Monicelli is about a giant strike at a factory in late 19th century Italy, and it's a great account of labor rights.
• Hunger by Steve McQueen is about Bobby Sands, the IRA member who went on hunger strike and helped to push one of the largest waves of revolutionary energy in Northern Ireland.
• La Haine by Mathieu Kassovitz is a truly great film about a group of friends dealing with the aftermath of a riot in a Paris suburb after the Parisian police violently arrested and later killed an Arab boy. Huge parallels to George Floyd in the US, and a perfect case for ACAB.

Happy to offer more recs as well, but I'd start with these as all are fantastic. Z and Wind That Shakes the Barley are also amazing but have already been mentioned here.