Allies of convicted felon Hiram Monserrate say they will file a lawsuit against the city’s Board of Elections for moving polling sites from his stronghold in LeFrak City in Queens.

They claim the move was engineered by the Queens Democratic Party to hurt Monserrate in the Sept. 12 Democratic primary for the City Council.

Monserrate is attempting a comeback to reclaim his old seat, but the party establishment is backing Assemblyman Francisco Moya.

“Why was this done? To help Monserrate’s opponent,” charged plaintiffs’ lawyer Arthur Schwartz.

Other plaintiffs include the head of LeFrak City’s Tenants Association and the Black Leadership Action Coalition headed by Monserrate supporter Bertha Lewis.

The elections board said the polling sites had to be moved to comply with a federal court order to make all 1,200 city polling sites accessible to disabled voters.

But the complaint being filed in Manhattan state Supreme Court claims the move will disenfranchise 4,500 disabled and Black and Hispanic voters. The new sites are the Arts and Business HS at 105-25 Horace Harding Expressway nearly three-quarters of a mile away and PS 13, one third of a mile away at 55-01 94th St.

Plaintiffs said they and LeFrak City’s management, sought to resolve the dispute by offering alternative sites in the LeFrak complex that were ADA compliant. But the elections board refused to rescind the relocation order, according to the complaint.

“Even more unfortunate is the Board’s self-defeating pretext for the move, to remedy access issues under the guise of the American with Disabilities Act, have adopted a solution which will prevent many disabled plaintiffs in LeFrak City from accessing the franchise,” the complaint says.

An election board official dismissed as preposterous the claim that the polling site change was done to tip the scales against Monserrate.

“This was not done for any reason but to comply with a federal court order,” the board source said.

Monserrate, 50, is attempting a comeback after being found guilty of misdemeanor assault after slashing an ex-girlfriend, which led to his expulsion from the state Senate. He was also convicted of scamming more than $100,000 in government funds to help fund a failed political campaign and served three years in prison.

Meanwhile Moya — Monserrate’s opponent — said he, too, supports the lawsuit.

“Ensuring that every voter has the opportunity to vote is a bedrock of our democracy. I have written to the Board of Elections and the Justice Department to demand that poll sites at LeFrak City be returned to LeFrak,” Moya said.

“I fully support any and all efforts, including a lawsuit, to ensure LeFrak residents will be able to make their voices heard on September 12th. To guarantee everyone’s basic rights I am committed to making sure that vans and vehicles are available to shuttle residents to the new polling place if we do not prevail in court.”