Chukka Ummuna, "beseeching" Corbyn to "call off the dogs" in order to prevent "centre left" (ha) people being deselected or leaving the party.
Why the (ha) ?
He is talking for the Centre Left which is the majority of Labour MPs.
They do fear that they will be deselected if they do not pretend to believe in Far Left ideology. Three local parties have already passed votes of no confidence in Centre Left MPs to demonstrate that they have the numbers to do it.
Momentum are to try to get through conference a motion to make deselection easier.
Labour is being taken over by the Far Left and the existing MPs will not be allowed to get in the way.
Last time few joined SDP because their position in the party was not threatened. If they think they will be deselected anyway, they might as well jump.