Not directly with gun control, but "control" itself,  Just ONE side effect of the Patriot Act on millions of US citizens ?
Homeless people are prohibited from getting a Post Office Box. from opening a bank account. Prohibited from getting a state ID, prohibited from getting a job, if you follow all of the law to the letter. If you are homeless on the street and unable to "prove physical presence", you no longer have the rights to any of these items.

How does any of that help Americans stay safe ?  Safe from the homeless so they do not invade ? It's about control.  Then we have our local government crying about everything blaming it on the homeless. "Visitors are down, its the homeless fault" that’s a lie, Visitor counts are higher than they have ever been. The government needs to focus all of us on a "common enemy" and then get us to argue amongst ourselves with distractions.  And they have been doing a very good job of this for years now while they continue to strip our rights.