Banning anti-Zionism from US college campuses

I like it when Zionists (including the State Department) say with a straight face that criticisms of Israel can be anti-Semitic if they are "excessive".  I have a solution: why doesn't the US government create a special office to clear and measure our criticisms of Israel to decide whether they are too excessive to ban them before we express them.  Are people aware how repressive and intolerant Zionists hoodlums in the US are and how much they pose a threat to the 1st amendment?