Steve Neavling

 Accused mobster Joseph “Mousie” Massimino is suspected of conducting Mafia business from behind closed bars, the Philadelphia Daily News reports.

Among the evidence is a letter that Massimino sent to a friend in 2005 while locked up in New Jersey’s South Woods State Prison.

The letter advises a friend to “get in touch with Michael and tell him to tell his mother to tell her husband that he better get my f—in money.”

Federal prosecutors plan to argue their case at an upcoming mob-racketeering trial.

Massimino’s attorney, Joseph Santaguida, hopes to convince a judge to keep the letter from the jury.