Here are a few suggestions from me as I'm somewhat of a cinema buff.
2001: A Space Odyssey - full of masonic symbols
2010: The Year We Make Contact - same as above
Ace in the Hole - Billy Wilder's vision of America's media circus
Air America - CIA drug smuggling
Andrzej Wajda: Three War Films: The Criterion Collection (A Generation, Kanal, Ashes and Diamonds)- struggle for personal and national freedom (I especially liked Kanal, very intense)
Army of Shadows - Melville's masterpiece about underground fighters in battle against Hitler's regime
The Bad Sleep Well - Kurosawa exposing the corrupt boardrooms in post war corporate Japan
The Beast (1988) - Soviet Union in a futile war in 80's Afghanistan
Casualties of War - Brian DePalma Vietnam war epic
City of God - of the the best films you ever see, Brazilian
Born on the Forth of July - Oliver Stone protests the war
Cypher - great cyber thriller about corporate espionage
The Dreamers - besides all the nudity I find the film to be a great criticism of the French 60's communist movement and Jean-Luc Godard, honest

Equilibrium - Fahrenheit 451 with guns

Eyes Wide Shut - again Kubrick with masonic symbology
Gattaca - genetic perfection
Glengarry GlenRoss - classic film, "Lie, cheat, steal. All in a days work"
I, Claudius - BBC series about Roman emperors
The Insider - about the tobacco industry, big corporate interests
La Haine - great modern day French film about racial and cultural volatility, immigration
Lawrence of Arabia - I think it's about the middle east or something...
Krzysztof Kieslowski's The Decalogue - Polish cinematic masterpiece, uses the Ten Commandments as a thematic springboard, 10 part TV series (if you watch just one thing I recommend make sure it's this)
The Leopard - Italian film about when the aristocracy lost it's grip and the middle classes rose up
Lord of the Flies - I prefer the 1990 version
Natural Born Killers - Oliver Stone criticizes the media
Nixon - Oliver Stone again
Nosferatu - the Rudy Giuliani story

The Pentagon Wars - government waste at it's funniest, A Ron Paul fan should love it
Platoon - Oliver Stone war epic
Pump Up the Volume - freedom of speech on the radio
Rome - HBO series historic, Old World Order

Rules of the Game - regarded as one of the greatest films ever made, French
The Ruling Class - Peter O"Toole is hilarious
Salvador - Oliver Stone film about war torn El Salvador
Serpico - Pacino finds out that honesty is not expected to be part of his job as a cop
Stalker (1979) - one of the greatest movies ever made (IMO), Russian film
Traffic - useless drug war
Wall Street - Oliver Stone takes on...
The Wire - HBO series about real life in the streets (drugs, political corruption, etc.)
All of those films are more worthy to be up there than some those you have already listed.