There has not been any increase in anti semitism in Labour since Corbyn became leader.
A survey done last year by the Institute for Jewish Policy Research found that, “Levels of antisemitism among those on the left-wing of the political spectrum, including the far-left, are indistinguishable from those found in the general population. Yet, all parts of those on the left of the political spectrum – including the ‘slightly left-of-centre,’ the ‘fairly left-wing’ and the ‘very left-wing’ – exhibit higher levels of anti-Israelism than average. The most antisemitic group on the political spectrum consists of those who identify as very right-wing”.
Secondly, a survey done by YouGov in 2017 for the Campaign against Antisemitism found that endorsing at least one antisemitic statement was much more prevalent among Conservative and UKIP members (40% and 39% respectively) than among Labour and Liberal members (32% and 30% respectively). By comparing results to the 2016 survey, YouGov also found that antisemitic attitudes have fallen significantly in the Labour Party in the two years sine Jeremy Corbyn became Leader
The JPR survey also shows that all parts of the left, from moderate to hard left, are more anti-Israel than other people. The Board and the Council, supporting Israeli policy to the hilt as they do, but knowing their arguments are weak, want to eviscerate the Labour Party’s willingness to criticise Israel.
The Board’s and the Council’s motives are well illustrated by their proposed agenda for meeting Jeremy Corbyn, also in their letter of 28 March. The agenda items are really demands, three of which, if accepted, would cede the Labour Party’s independence in dealing with allegations of antisemitism