It has traditionally been illegal for the US to spread propaganda to US citizens: http://www.theguardian.com/technology/2011/mar/17/us-spy-ope...

But in 2013: http://thecable.foreignpolicy.com/posts/2013/07/12/us_backs_...

There should be a law that requires the US government to put a notice on anything that could be considered propaganda. Hopefully that would mean more transparency, which is a good thing.

Technically, it is not "US", it is "private companies" (media).

Just like with censorship. Plausible deniability, but getting their way anyway.