Labor's deputy leader Tom Watson said a local party was under investigation for alleged treatment of MEP Luciana Berger.
Mr. Watson accused the branch members of Liverpool Wavertree of "bullying" the MP and trying to evict it.
The branch closed a meeting to speak about a no-confidence motion with Mrs. Berger after an angry backlash.
It said it had "no control" over the applications filed by members and rejected allegations of bullying and anti-Semitism.
In the BBC's Andrew Marr Show, Mr. Watson said, "This motion should never have been moved in its local party, the meeting should never have been planned."
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He said Mr. Corbyn "made it clear that these things are not being done in his name" and "they do not help him, they damage the reputation of the Labor Party".
Mr. Watson added, "I do not want a MP or a member of the Labor Party to feel bullied and expelled, and what happens to them is totally unacceptable, which is why I called on the local party to suspend it."
"Total solidarity & # 39;
Labor Secretary General Jennie Formby said she did not have the constitutional power to suspend the local party, but Mr. Watson confirmed that Ms. Formby was "investigating members in that constituency".
In a statement, the leaders of the Wavertree Labor Party said: "As an executive, we have consistently and completely expressed solidarity with Luciana as a victim of misogyny and anti-Semitism – mostly from the far right.
"Our chairman is a Jew himself, and the suggestion that the CLP executive is in any way a party to bullying and anti-Semitism is a false and slanderous accusation."
They defended the planning of a meeting to discuss the motions for censure and said that it was "giving our MEP the best possible chance to participate in the debate on the motions".
The executive added that they "strongly reject the inaccuracies of the media and the allegations of political bullying for simply adhering to the party's rules and doing our job.
Ms. Berger, a Jewess, was an outspoken critic of the party's treatment of anti-Semitic charges and their attitude to Brexit.
The movement that was pulled criticized her for "constantly criticizing Jeremy Corbyn with the media."
Shadow Chancellor John McDonnell triggered a backlash among some Labor MPs after suggesting on Friday that the decision against Ms. Berger was more due to her unfaithfulness to the leadership than to anti-Semitism.
He called on Ms Berger to publicly denounce allegations that she supported a Labor Party escape, and the media speculated that MPs who were not enthusiastic about Mr Corbyn's leadership wanted to start a new party.
Watson said he was worried about escaping from speculation about the creation of a new party by Labor MPs because we needed unity to win the next parliamentary elections. "
Watson told Andrew Marr that he knew of "a MP who had spoken" of a MP who had changed his voice because he was afraid. "