Since when? How would that even work? The president orders the NSA to generate a list of disagreeable film makers and journalists and passes it to the TSA and customs? Do you have any evidence for that claim at all?
> It wouldn’t be wise to talk about bombs near an airport, or tweet about killing the president when he’s visiting your city.
Those are not free speech issues. It is not illegal to talk about bombs at an airport or to threaten the president. Just because you shouldn't does mean you're not free - freedom from consequences isn't the same as freedom of action. Restricted speech is exceedingly rare and, to my knowledge, only applies to public safety (falsely yelling fire in a theatre) and inciting violence (rallying everyone to get weapons and go shoot cops)