committee labour party eight ni northern ireland
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The eight include the chair, vice chair and secretary of committee.
Kathryn Johnston, who is among those who have stepped down, said there was a "dysfunctional element" in the party's regional executive.
However, the new chairman said the committee rejected all the allegations of former committee members. Their positions have now been filled.
Those who resigned said they were stepping down due to their concern about "a small minority" who, they claim, support other political groups but are "secretly organising" within Labour.
The eight said the activities of those who they term a "vocal and troublesome element" were contrary to the Labour Party's rulebook.
Ms Johnston, who is a former secretary of Labour NI, said they had taken the decision after five months of meetings.
Ms Johnston claimed on Good Morning Ulster that administrators of the People Before Profit Facebook page are also Labour NI members, something that is against Labour Party rules.
"Rules are rules, it is quite clear. Chapter two of the Labour Party rules [says] you can't be a member of two parties," she said.
Boyd Black, chairman of Labour NI, said the resignations were made before an executive committee meeting on Monday night.
He said it came "after a number of grassroots party activists had indicated that they would attend in order to call the [former] EC members to account on a number of issues, including inactivity and lack of accountability."
He said the party "remains fully committed to Jeremy Corbyn's 'For The Many Not The Few' policy manifesto."
The resigning officers remain members of the Labour Party.
A spokeswoman for People Before Profit said: "We have no knowledge of any current members of People Before Profit who are involved at any level in the Labour Party of Northern Ireland.
"Reports of People Before Profit members involved in entryism into the Labour Party of Northern Ireland has come as a surprise to us."