Keep exposing these nazis. Make their faces known, let people know where they work, make them lose their jobs.
No, it isn’t a first amendment issue. Look at it this way:
If you’re an employer and you have a far left employee, he or she may believe in universal health care and gay rights and maybe even communism if they’re way out there, and it’s very likely that will never come up at the job and won’t affect their employment in the slightest.
But if you have an alt-right nazi KKK member working for you, then they believe that people who aren’t like them are inferior, should be kept out of the country, should have no rights. And they’re probably going to be dealing with women and minorities and gays and immigrants in the job — and even your other employees. Their views absolutely affect not just their jobs but your reputation as an employer. How can a black person or a gay person or a Jewish person expect to be treated with respect from your business when you have people like that working there?
So yes. Expose them. Make them realize there are consequences to their hatred.