This is dystopia in the making, 1984 coming alive, first of all; why someone's social media activity would be the matter of the government? Everybody in the world has freedom of speech, it is a human right. US will no longer be free if it peruses politically motivated persecution and segregation. This is political hysteria akin to anti-communist and anti-Japanese hysteria during WW2 and after.
And secondly why would US government target only anti-semits, will they check for anti-white racism, African-American racism, anti native-American racism, homophobia etc. This is a mess of a policy. And Trump is openly homophobic and anti-LGBTQ+, what that should tell us?
Abraham Lincoln said: "At what point then is the approach of danger to be expected? I answer, if it ever reach us, it must spring up amongst us. It cannot come from abroad. If destruction be our lot, we must ourselves be its author and finisher. As a nation of freemen, we must live through all time, or die by suicide."