( CNN ) -- Reputed mob boss James `` Whitey '' Bulger slouched uncharacteristically in his chair Monday , muttering `` I 'm not ( a ) f***ing informant . '' But his 700-page FBI file and informant card show otherwise -- that Bulger provided information on murders , drug deals , armed robberies and criminal fugitives , leading to several arrests . Bulger ratted on La Cosa Nostra , rival gangs and seemingly anyone -- except those in his small , immediate circle known as the Winter Hill gang . According to entries in his informant file , Bulger knew he could get away with it and even told his FBI handler he was more likely to be killed by `` gangland warfare '' than because he was informant since `` no one would believe it . '' Bulger also defended what he called the `` professionalism '' of the FBI . Bulger is charged with 19 counts of murder after the FBI found him hiding out in a Santa Monica apartment with his girlfriend in 2011 . He was on the lam for 16 years after allegedly being tipped off to a 1995 indictment by his rogue handler , former FBI agent John Connolly , who is now behind bars . Why we ca n't get enough of the gangster life . From day one of Bulger 's trial , his lawyers have tried to convince the jury that Bulger was not an informant -- something attorney J.W . Carney described as the worst thing an Irishman from South Boston could possibly be . With the jury out of the courtroom , prosecutor Fred Wyshak mocked the suggestion , saying he would `` not engage in the fiction '' -- pointing to 15 years of detailed FBI reports . `` Whether it 's the ego of the defendant or his reputation he wants to preserve that he was not an informant ... it 's a ridiculous contention , '' said Wyshak , who successfully prosecuted Connolly 's case in 2008 . The defense has filed a motion asking to admit into evidence statements made by Wyshak in the 2008 trial claiming that Connolly made false statements in his informant files . The motion has not yet been addressed in court . James Marra of the Justice Department 's Office of the Inspector General testified about numerous file entries saying Connolly , Bulger and Bulger 's criminal partner Steven Flemmi `` frequently met together as a team . '' Trial opens window on mob world of cold violence , fierce loyalty . Documents also expose that Bulger met with more than one FBI agent , including now-disgraced former FBI supervisor John Morris . Morris pleaded guilty to accepting bribes from Bulger in exchange for information . He is cooperating with the government in exchange for immunity and is set to testify against Bulger this week . Bulger 's defense lawyer Hank Brennan said prosecutors `` ca n't have it both ways , '' since Connolly is a convicted liar who , he said , fabricated Bulger 's 8-inch-thick file and his status as an informant . Judge Denise Casper weighed in , asking , `` Why ca n't both be true ? '' The judge said perhaps the definition of `` informant '' was the issue . Responding to Bulger 's claim , Casper said the `` veracity of information may be in dispute , ( but not ) that he was a registered informant . '' Along with the 700-page informant file , prosecutors also showed the jury a 3-by-5 card that they called Bulger 's `` informant card '' with his ID number : BS1455 OC . The OC stands for `` organized crime . '' When Brennan accused the Department of Justice of having a history of `` inappropriate relationships with crime figures '' even when it came to murder , the judge shut him down . Witnesses , jurors shed tears as trial focuses on killings .
James `` Whitey '' Bulger faces 19 counts of murder . A 700-page FBI file says he was an informant , ratting out criminal fugitives . He is accused in the murders of two Boston police officers and a U.S. senator who were gunned down during a robbery at his South Boston, Massachusetts home on April 19, 1975. The prosecution says the claim is `` a ridiculous contention ''