Momentum have already called for the deselection of:-
John Mann
Kate Hoey
Graham Stringer
Then there is the question of the likes of :-
Dennis Skinner , Ronnie Campbell and Kelvin Hopkins who voted against Labour recently but would Momentum follow through with deselected them, I doubt it , although even Skinner was called a ' Scab ' by Corbyn supporters. When that happens no MP is safe that does not come from the far left of the Labouyr Party.
Frank Field of course is no longer a Labour MP but stands as an Independent
The far left / left of Labour is now totally in control of Labour except for the Parliamentary Labour Party that is why deselections will probably be numerous.
From Corbyn the Leader , his ' Inner Circle ' , the shadow cabinet, the NEC, the party conference, most of the Unions, the party membership new and ' returned ' , all strongly backed by Momentum , pro-Corbyn blogs and social media the centrist Labour Party MP's and members will not stand a chance.
It is out of date a tad but over the years since Jeremy for Leader / Corbyn / Momentum started the ' HOSTILE LIST ' compliled then still gives an insight to those who are still sitting MP's .