Before Parasite, there was this subtle, home invasion movie.

I pride myself on being able to find anything on the web. It's a matter of phrasing the query. This one eludes me so I'm joining this forum with the hope that maybe you could help. I watched Parasite recently and it reminded me of an eastern european (maybe), black and white (maybe) film I saw several years ago. This organized group of thieves (dare I say gypsies, maybe) emerge from underground dens in the forest and slowly take over a wealthy household, eventually murdering all the family members. They are discovered at the end and run back to their individual lairs. This is after an extensive search that turned up nothing. Anyone?