I mean this will probably work. Pretty good chance. The US really, really, really does not want to abandon the zionist project of occupation, settlerism, and genocide in Palestine and they don't want it to go the way of apartheid South Africa so they have to criminalize and demonize those protesting it and the best way to do that is to cloak it in progressive language of it being bigotry, religious hatred, anti-semitism, etc. This will of course cause a growth of reactionary ideology among people who find the progressive path closed and begin to indulge the talking points of waiting and patient neo-Nazis and other anti-semites which is of course all too beneficial for the ruling class.
So then you'll have a situation where you can be fired and in fact will be fired from many jobs if they find out you're an anti-zionist as you'll legally be seen as no different than a member of the Klan or a neo-Nazi. So anti-zionist speech will no longer be protected for government employees almost certainly and much less so for private sector employees.