Federal authorities have secured a fifth conviction in the Hoboken cash-for-votes scheme that jolted the Mile Square City’s political scene and shined a spotlight on voter fraud.

William Rojas, 69, admitted in Newark federal court on Tuesday that he conspired with others to use the mail to promote a voter bribery scheme during the 2015 municipal election in Hoboken, U.S. Attorney for New Jersey Craig Carpenito announced.

Rojas is the fifth person implicated in the conspiracy who has either pleaded guilty or convicted at trial. A jury found former Hoboken developer Frank “Pupie” Raia guilty of conspiracy to violate the federal Travel Act for using the mail for voter bribery during the 2013 municipal election. Raia faces a maximum penalty of five years in prison and a $250,000 fine, but has filed a motion for a new trial.

According to Carpenito’s office, Rojas worked for a Hoboken City Council candidate from September 2015 through November 2015. At the candidate’s direction, Rojas and a conspirator, Matthew Calicchio, agreed to pay certain Hoboken voters $50 each if they applied for and cast mail-in ballots for the November 2015 Hoboken municipal election.

Rojas provided the voters with vote by mail applications and after receiving the completed mail-in ballots from voters, Rojas and Calicchio reviewed them to ensure that voters had voted for their candidate. After the election, Rojas delivered $50 checks to the voters whose mail-in ballots he collected.

Rojas faces a maximum penalty of five years in prison and a $250,000 fine. Sentencing is scheduled for Feb. 20, 2020.

Calicchio pleaded guilty to his role in the scheme in May and is scheduled to be sentenced Nov. 7.

The first woman arrested as part of the probe, Lizaida Camis, pleaded guilty in November, less than two months after she was charged. Another conspirator, Dio Braxton, pleaded guilty in May.

Raia, who orchestrated a similar operation during the city’s 2013 municipal election, stood trial earlier this year but was convicted after two days of jury deliberations. Raia’s motion for a new trial assertes that the testimony of Calicchio and two other men who were implicated in the scheme but were not prosecuted was not credible.

That year, Raia ran for an at-large council seat on the One Hoboken slate. Raia was also pushing for a referendum that would have weakened rent control laws. Both he and the referendum lost.

“Paying cash for votes will never be tolerated in Hoboken, and I thank the federal authorities for helping root out this illegal activity from our City,” Mayor Ravi S. Bhalla said in a statement. “We must redouble our efforts to stamp out voter fraud and protect the integrity of our elections.”