Robert Mackey writes: At first glance, the heated argument two members of the British Labour Party conducted in front of reporters’ iPhones on Thursday, sparked by accusations that one of their colleagues posted anti-Semitic comments on Facebook, seems like a story of interest mainly to political junkies in London.

Watch this. Extraordinary. John Mann MP: You're a disgusting Nazi apologist, Livingstone'. pic.twitter.com/1wlbA1BmND

— Chris Ship (@chrisshipitv) April 28, 2016

When the debate is unpacked, however, it becomes clear that what’s at stake is something much broader: whether critics of Israel, who question its government’s policies or its right to exist as a Jewish state, are engaged in a form of coded anti-Semitism. That matters because attempts to disqualify all critics of Israel as racists are widespread across the globe.

In the United States, for instance, supporters of a movement to boycott Israel until it grants Palestinians full civil rights have recently been condemned as anti-Semites by Hillary Clinton; last month, the University of California adopted a policy on discrimination that implies anti-Semitism is behind opposition to Zionism, the political ideology asserting that the Jewish people have a right to a nation-state in historic Palestine.

But how did this issue come to dominate the political debate in Britain, a week before important local elections? [Continue reading…]