Scotland Yard will investigate a leaked dossier detailing alleged cases of anti-Semitism in the Labour Party after a senior police officer warned that they constituted hate crimes.

Labour has been accused of incompetence as a Metropolitan Police official said that files on 21 party members being probed for anti-Semitism all passed the threshold for investigation.

The document contains 45 cases of Labour Party members accused of anti-Semitism, nearly half of which were deemed to be a race-hate incident, according to Mak Chishty, a former hate crime investigator for the Met.

The files, obtained by LBC, include allegations that a Labour councillor inflicted “ten years of hell” on a child by calling him a “Jew Boy”, while another member allegedly asked: “Shall we rid the Jews who are cancer on us all”.

In a separate file, one activist is said to have suggested inviting two MPs to a charity abseiling event so that others present could “throw them off the top - no ropes”.