I remember a horror movie from the 1980's and only remember vague details. People hiding under the floor, looking up toward the ceiling where someone is walking.Can see through wooden floorboards. Don't believe it's "The People Under the Stairs".
The "horror" classification kind of rules of any movies related to the Underground Railroad, Gleichshaltung countermeasures or subsequent situations likewise. I take it the people in under the floorboards/walls in the movie sought are being kept there not for their protection but as captives of some sadistic monster. Yes?