Hetznecker cited a government memo, which has not yet been made public, that alludes to seven uncharged crimes tied to Borgesi that the prosecution wants Monacello to testify about.
None of the crimes is linked to the racketeering conspiracy case before Robreno. Allowing the jury to hear about them, Hetznecker said, would "undermine my client's right to a fair trial." Hetznecker also said the charges were unfounded and had no basis in fact.
Borgesi, his uncle, reputed mob boss Joseph "Uncle Joe" Ligambi, and seven others are scheduled to be tried on racketeering conspiracy charges in October. The case revolves around allegations of gambling, loan-sharking, extortion, and the operation of illegal video poker machines.
Friday's hearing focused on objections defense attorneys have raised to the prosecution's plan to introduce evidence about the violent history of the Philadelphia mob. The defense contends that it is irrelevant and prejudicial.
Robreno said he expected to rule on the motions within seven to 10 days.
In addition to Monacello's allegations, lawyers argued at length about the admissibility of conversations from two secretly recorded mob meetings picked up on a body wire worn by a cooperating government witness.
The meetings, at restaurants in North Jersey, included discussions about murders, extortions, and mob initiation ceremonies.
Assistant U.S. Attorney Frank Labor described one of those meetings, at La Griglia, a restaurant in Kenilworth, N.J., as "tantamount to a meeting of the board of directors of organized crime."
Ligambi, 73, codefendants Joseph "Scoops" Licata, 71, Anthony Staino, 54, and Louis "Big Lou" Fazzini, 45, attended that session along with several reputed leaders of New York's Gambino crime family.
Though the restaurant meeting tapes have been discussed in several previous court documents, references to Monacello's allegations had not been made public before Friday's hearing.
Monacello, 43, was indicted along with Borgesi, Ligambi, and the others in May 2011. He began cooperating with the government a few weeks after he was jailed, alleging he did so because he believed Ligambi was going to have him killed.
Monacello has been described as a close associate of Borgesi's who ran the mobster's bookmaking and loan-sharking businesses after Borgesi was jailed on racketeering charges in 2000.
Borgesi was sentenced to 14 years in prison. He was less than a year away from release when he was indicted in the current case.
According to arguments in court Friday, Monacello has alleged that he was riding in a car with Borgesi sometime in the late 1990s when Borgesi bragged about his involvement in a number of murders, using hand signals to indicate he had been responsible for 11 killings.
Monacello has also alleged that he carried out assaults on Borgesi's orders and that Borgesi assigned him and others to attempt to intimidate witnesses in the 2001 case. He also said Borgesi gave him a revolver, a machine gun, and ammunition.
Monacello's credibility is expected to be vigorously attacked during the trial.
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