The Anti-Zionist tag is interesting. It seems that it's actually an extension that would be used by Zionists, as it identifies anti-zionists, and the wording incorrectly claims that anti-Zionism is hate speech (whereas it is in fact Zionism that is hate-based ideology).

A lot of Zionists claim -- incorrectly -- that all Jews as Zionists. But certainly the major groups of Zionists are Christian zionists and Jewish Zionists. I would say there is a very very high chance that if you use the Anti-zionist Tag Chrome extension, that you are Jewish.

So it seems quite likely that Linkedin is actually tracking Jews with this.