The rationales vary and multiply. But they stop at this: Under Jeremy Corbyn, the Labour Party has become, in the words of many of its own members (or former members), “institutionally anti-Semitic.” Dwell on the word “institutionally”: It means it isn’t just a matter of some bad apples. The question for the British electorate — and for anyone else who takes a rooting interest in the country’s politics — is whether or not they seriously care.

The latest evidence comes in the form of a recently leaked 53-page document by the 2,500-member Jewish Labour Movement (J.L.M.) to Britain’s Equality and Human Rights Commission. It chronicles “relentless” and “daily” incidents of anti-Semitism within the party.

“One respondent lists 22 examples of anti-Semitic abuse which have been directed at him,” the document notes. “Examples of these include being called ‘a Tory Jew,’ ‘a child killer,’ ‘Zio scum,’ being told that [he’s] good with money,’ ‘to shut the f— up Jew,’ ‘that Hitler was right,’ and being threatened with physical violence.”

The rot goes to the top.