Invitation to Ruin (1968)

Pick-up artist Jerry Sloane is hired by mobster Ernie Pulaski to lure girls for his white slavery ring. Once Ernie gets his claws on them, the victims are turned over to mute Mama Lupo (she lost her tongue after tattling on some fellow schoolgirls), who tortures them in her dungeon and addicts them to heroin. Jerry unwisely falls for Ernie's daughter, resulting in a particularly painful, if appropriate, vengeance.