and put movies with such themes on restricted list. No kidding:
Most explicitly racist:
Planet of the apes--no further comment needed
Lord of the rings--racial war(over certain meaty diet) romanticised.
Most of them carry thinnly veiled anti-immigrants message, always with some unsavoury races/mutants hell bending on conquering the white world. Examples abound: Aliens, star trek, District 9, X-men...