An MP who led the revolt against anti-Semitism in Jeremy Corbyn’s Labour Party has been branded a ‘Jew whore’ who should burn ‘in the ovens’.

Joan Ryan, who quit Labour last month in protest at the party’s ‘culture of anti-Semitism’, called in police after receiving two separate death threats in the wake of her defection.

One was an unstamped handwritten note delivered to Ms Ryan’s Commons office on Friday which branded her a ‘****-sucking Jewish c*** who defected to Israel’ who should be raped and ‘set on fire’,

The other letter, received at the MP’s constituency office in North London on Thursday, said: ‘Stop telling lies about Jeremy Corbyn - he is a decent man, you lying Jew whore. You need to be shoved right back in the ovens’.

Ms Ryan has also passed to Scotland Yard the registration number of a black car that was parked near her constituency office with three men inside last week. She fears they were placing her under surveillance.

Ms Ryan, 63, is not Jewish but has been an outspoken critic of the party’s handling of the anti-Semitism crisis.

She left Labour last month to join the new Independent Group in protest at Mr Corbyn’s failure to tackle the issue.