Coatham Protest

So what does it actually mean when a Labour MP ''persuades'' people to stand in election for a party or group other than the Labour Party against Labour party candidates? An independent councillor from Middlesbrough told me two months ago that if that has happened, then that Labour MP by rights, should be thrown out of the Labour Party.

Does anyone know for sure if this is true?

Perhaps I will contact Walworth Road to see if I can find out more?