Gotti said to order snitches killed.

Friends of ours: Gambino Crime Family, Peter Gotti, Primo Cassarino, Richard Gotti, Genovese Crime Family, Lawrence Ricci

A convicted Gambino soldier testified in a union-corruption trial yesterday that Peter Gotti once warned that if anyone cooperated with the government, he would, "kill them and their families."

Primo Cassarino, who was convicted with Gotti in 2003 for shaking down action-movie star Steven Segal, said in Brooklyn federal court yesterday that he had spoken to the FBI about cooperating with the government during that trial. But when asked why he decided to go to trial with the former Gambino boss he said, "I didn't have no choice. If I didn't go to trial, I'd have been killed by Peter Gotti. Peter Gotti told his brother, Richard, if anybody cooperates, kill them and their families."

When Richard Gotti relayed his brother's warning, he was unaware Cassarino had spoken to the FBI, Cassarino testified under cross-examination in the trial of Harold Daggett and Arthur Coffey. The two International Longshoremen's Association members are accused of conspiring with the Genovese crime family to have them installed as union heads.

Another co-defendant, reputed Genovese capo Lawrence Ricci, has been missing since the start of the trial, leading to speculation that he has been the victim of a mob hit. Ricci is accused of steering an ILA contract to a pharmaceutical company with mob ties. When asked why he had decided to be a government witness this time around, Cassarino said he was hoping to have his sentence reduced. Cassarino's conviction was for racketeering and money-laundering after he tried to force Segal to give them a cut of movie profits in a deal brokered by his former producer.