Police concerns that gang members are trying to infiltrate the force must be taken seriously by the Government, Labour says.
The party's police spokesman, Kris Faafoi, says the situation is unprecedented and ministers must heed the call for more funding so checks on recruits can be maintained.
Police Association president Greg O'Connor raised the alarm at the association's annual conference in Wellington on Wednesday.
He said "dozens of people" with criminal backgrounds attempting to join the force had been identified in background checks.
But with no new Government funding police might not be able to maintain those checks, he said.
"Under a funding freeze, every part of police is under pressure and that includes recruiting," Mr O'Connor said.
Mr Faafoi says the Government must listen.
"Funding constraints may mean gang members trying to infiltrate the force go unnoticed - this is something new," he said.
"Budget cuts and staff cuts are leaving our police more vulnerable."
Police Minister Anne Tolley, who aLso addressed the conference and praised police for cutting crime rates, warned they would have to do even better without any more money in the near future.
Canterbury University professor of sociology Greg Newbold is not convinced a large number of gang members could get into the police:
"It's not beyond the realms of possibility that a gang member might try to get into the police in order to access their intelligence systems, but for considerable numbers of gang members trying to do that is beyond belief."
Prof Newbold says he would like to see the evidence Mr O'Connor is basing his claims on.
NZN / RadioLIVE