This is the story of how the institutions of British Jewry went to war with Jeremy Corbyn, the leader of the Labour Party. Corbyn is another feather in the wind of populism and a fragmentation of the old consensus and politesse. He was elected to the leadership by the party membership in 2015, and no one was more surprised than he. Between 1997 and 2010, Corbyn voted against his own party 428 times. He existed as an ideal, a rebuke to the Blairite leadership, and the only wise man on a ship of fools. His schtick is that of…