Nomads

A French anthropologist specializing in nomadic groups moves to Los Angeles with his wife, and starts following a group of sinister street punks who seem to live and move around in a black van. But they aren't what they seem.

Nomads is a 1986 drama mystery movie directed by John McTiernan, starring Lesley-Anne Down, Pierce Brosnan, Adam Ant. It holds an IMDb rating of 5.2/10 from 6,096 votes and runs 1h 31m.