The Streatham MP made the comments after leading pro-Israel MP claimed so-called moderates faced a clear and present danger of being run out of the party by hard-left factions.
Ms Ryan blamed the result on Trots, Stalinists, Communists and assorted hard-left, while Mr Shuker, who was elected in 2010, said: I’ve not changed, but the Labour Party has.
In a speech to the centre-left group Progress on Saturday, Mr Umunna is expected to say MPs are being targeted for standing up for zero tolerance of racism.
More motions such as this are expected by colleagues, he will say.
My message to our leadership: it is within your power to stop this so call off the dogs and get on with what my constituency, one of the most diverse communities in the nation, demands we do without equivocation, fight this Tory Brexit. That is where all our efforts should be.
Mr Umunna wil say the Brexit debate has normalised hatred and black and minority ethnic voters had paid the price.
He is expected to warn the Labour leadership it would be a complete betrayal of the party’s values to act as a bystander and wave through this disastrous Brexit and call for it to back a referendum on the final deal.
The Streatham MP is expected to say: “It is simply not good enough to adopt a position which refuses to make the case for a people’s vote on th e deal and at the same time leave it on the table as an option in the event of impasse in the House of Commons.
That is simply constructive ambiguity continued, which needs to be junked.
Let’s dump the prevarication, stop using internal factional reasons as an excuse to avoid it, and back a people’s vote wholeheartedly now.