The Wizard of OZ
A Clockwork Orange
A Clockwork Orange is a good one, or really any Stanley Kubrick film, or any good film from the 70s era.
Serpico
Taxi Driver
Midnight Cowboy (1969... close enough)
Panic in Needle Park
Texas Chainsaw Massacre
Dog Day Afternoon
The Godfather I/II
The Exorcist
Apocalypse Now
The Deer Hunter
etc.
What a lot of those movies have is realism - the actors aren't caked in makeup, scenes aren't rushed, and the environment is gritty.
The people in the films look like real people you'd see on the streets, not supermodels, but maybe part of that is just looking at an era I never grew up in.
Texas Chainsaw Massacre (1974)
Texas Chainsaw Massacre (2003)
