Left-winger Emma Dent Coad has said she is "devastated" after being blocked from standing as a parliamentary candidate in Kensington.
The former Labour MP - who lost her seat at the 2019 general election - criticised the party and said the selection process is "not fit for purpose".
The campaign group Momentum said the move was a "travesty of justice" while the former Shadow Chancellor John McDonnell urged Keir Starmer to "urgently intervene and ensure fair process" in selections.