The Labor official at the center of an anti-Semitism dispute has resigned from the party's governing committee.
Christine Shawcroft said her membership of the NEC was "a distraction for the party and an excuse for endless intrusive media harassment from myself, my family and my friends."
The series erupted after suspending one Council candidate accused of Holocaust denial.
Ms. Shawcroft will be replaced at the NEC by comedian Eddie Izzard.
Dozens of Labor MPs and peers had asked Labor leader Jeremy Corbyn to suspend Ms. Shawcroft from the NEC
In a statement announcing her resignation on Saturday night, she said, "I reaffirm my total opposition to anti-Semitism and me detest the Holocaust denial and support all measures to address this within the party. "
She added that she" will use all my energy to secure the Labor government under Jeremy Corbyn for our country, which she Urgently Needs. "1
On Thursday, Ms. Shawcroft, who is part of Momentum's Corbyn support campaign, resigned from a position other than the Labor Party's leader.
Alan Bull, who stood in Peterborough in the local elections in May, stepped into a larger series in which Mr Corbyn was accused of having failed to address anti-Semitism within his party, especially within his left flank.
Mr. Corbyn himself was criticized last week for opposing the removal of an anti-Semitic mural in East London in 2012.
Analysis: By Chris Mason, BBC Political Correspondent
Christine Shawcroft Is One of the Most Influential People in Jeremy Corbyn's Labor Movement You have probably never heard of it until at least this week.
Her CV reads like this: a director of the Pro-Corbyn Momentum group, the head of the Labor Dispute Committee and the occupier of a party leader ruling national executive committee
It's not so verbose anymore. Two of these three jobs are gone.
For the past few days, she has been the focus of the vociferous, bitter and very public series within the party on anti-Semitism.
I was told that in view of her position on the NEC was chosen instead of being appointed, it was her decision to face, but Jeremy Corbyn had talked to her and supported her decision to leave.
Izzard has twice for a seat in the NEC, most recently in 2017 campaign Since he was second only to Ms. Shawcroft in this election, he now takes over her position until a new vote in the summer.
He had previously said he wanted to "break down barriers" for the executive and make the party stronger welcoming groups that feel "isolated or excluded".