Representation of communism in American film

I am one of those people who enjoy watching movies every weekend with friends or family. It is sort of a hobby among friends to gather, make pizza from scratch, pop popcorn and sit down with a good, popular film.
As most movies that can be purchased all over the world are american ones, the choice is often simple to go with a mainstream one.

After watching the "Rocky" series, about the true American boxer, with the fair game attitude who always wins I noticed something very funny about how they portrayed the opponent of Rocky in the third film. This is the movie where he has to take down highly
 intimidating Ivan Drago. A boxer who is an insane
 6-foot 5 inch and 261-pound. Not only does is he given
 medications, special training with the use of 
machines and many, many doctors observing him at 
all times, show no form of sympathy or personality 
but he is also from The Soviet union.


This is of course not the first time this has been done in American film industry. In fact, it is very normal for them to represent the Eastern Europeans as the "Bad Boys" of american film. Just think about all the Russian and Chinese spies you have seen in "James Bond".

Here is just a short list of a few movies involving Dirty Communists from:  http://tvtropes.org/pmwiki/pmwiki.php/Main/DirtyCommunists

• Rambo First Blood Part II and Rambo III gave John Rambo the Reagan-esque patriotism that the previously disenchanted with America character has since become famous for.
  • The image of John Rambo as an uber-patriotic flag waver is a false one. At the end Rambo II he is so disgusted by the government's attempt to cover up the fact that American prisoners of war are still being held in Vietnam that he doesn't return home. In Rambo III he is motivated by his desire to rescue his old friend Colonel Trautman rather than duty to the country he was born in.
• Red Dawn is arguably the quintessential anti-communist movie of the 1980s.
• Red Scorpion shows Russians as inhuman killing machines, except the one who turns against them.
• Rocky IV created Ivan Drago whom remains one of the most recognizable symbols of Communism of the 80s.
  • An episode of The Colbert Report featured a "special update" on the Cold War. The opening montage featured Lenin, Stalin, Kruschev, Drago, and Yakov Smirnoff.
• America's favorite adventuring archaeologist fights some Dirty Communists in his fourth film, Indiana Jones and the Kingdom of the Crystal Skull.
  • This particular example seems more of a homage to Cold War era pulp fiction, fitting the overall theme of the series pretty well.
  • Dirty Communists were also the villains in LucasArts' game Indiana Jones And The Infernal Machine.
• Much of Chuck Norris' body of work. Especially Invasion USA.
• French comedy La cité de la peur features a hammer-and-sickle-wielding (literally!) serial killer. His motives are not political; however, he's copying a similarly armed killer from the film within the film Red Is Dead, a dirty communist indeed◊, who kills rich people because "profit was unbearable from his proletarian perspective."
• Clint Eastwood's film Firefox.
• Angelina Jolie's Salt is about the Soviet Union having a secret program of sleeper agents out to destroy the United States and restore the Soviet Union. Given they intend to blow up Mecca to frame the United States for it, they are a PROFOUND collection of dicks.

Why would this be necessary? Most of the movies are from the 80`s, where the shunning of Communism was at it`s highest, but the movie Salt with Angelina Jolie, actually show that Hollywood has not put this business behind themselves. 

Is this propaganda? Is this a warning from the state? Is it because it is easy to make up a story from? Or is it simply just childish? I`m not able to give a correct answer, but what I know is that at once I see a movie with this tendency, I think it is automatically stupid.