Rhea Wolfson, the Jewish Labour activist, has been elected to the party’s National Executive Committee.
She won 85,687 votes as one of six candidates backed by the hard-left Momentum group. All six won places on the party's ruling body.
Ms Wolfson, the only Jewish candidate in the race, ran for the NEC, after Ken Livingstone was suspended from the party over comments about Hitler and Zionism.
Speaking to the JC, Ms Wolfson said: “I'm incredibly excited and grateful to have been elected onto Labour's NEC.
“I will work towards building a more democratic and open Labour Party that respects all members and ensures all voices are heard.
“My priorities will be to implement the recommendations of the Chakrabati report with particular emphasis on ensuring a clear and transparent complaints and disciplinary procedure for both CLPs and individuals.
“The party must be a safe space for every member.”
Ms Wolfson originally stood for nomination in her Eastwood, Glasgow Constituency Labour Party.
But the activist failed to win after Jim Murphy, the former Scottish Labour Party leader, urged members not to vote for her.
She then transferred her membership to Almond valley in west Lothian and gained a nomination.
She is one of six candidates who won on the left wing Centre Left Grassroots Alliance (CLGA) slate, supported by the Campaign for Labour Party (CLPD) and Momentum.
The full house for CLGA means no one from the Progress and Labour First slates made it onto the NEC.
Luke Akehurst, director of We Believe in Israel, failed to get elected with 48,632 votes on the Progress slate.
This year saw an increase in votes following a spike in membership last year.
