when bobby took on momo giancana in a senate hearing in the 1950s, the fat was in the fire.that was never going to go away. >> so the fbi detail in chicago begins harassing sam giancana and his top lieutenants. >> they follow giancana everywhere, wiretapping his girlfriends, even on to the golf course. >> were we afraid? no. as a matter of fact, we were pushed very hard by robert kennedy to do everything we could. he was a great guy if you were his friend. i would not have wanted to be his enemy. >> bobby's investigations may be hitting too close to home. >> this guy was well known to joe kennedy, and he was a co-investor in a large casino. he and joe kennedy had bought condos in the hotel vicinity. >> wiretapped by the fbi, giancana makes a shocking allegation about joe kennedy. >> on the fbi tapes you can hear giancana bragging that he has a deal with joe kennedy, with the patriarch. giancana thinks that he helped jfk get elected by arranging for him to get some votes in chicago. is this the sins of the father coming home to roost? >> there's absolutely no independent evid

. >> one of the toughest gangsters that bobby summons before the senate is sam giancana. >> sam giancanae head of the chicago outfit. this is the most powerful wealthy section of organized crime. >> would you tell us about the vice operations down in lake county, indiana? >> i decline to answer because i believe my answer might incriminate me. >> bobby presses him with questions about bodies in trunks, and giancana takes the fifth 40 times and finally starts laughing. >> will you tell us anything about any of your operations? or will you just giggle every time i ask you a question? >> i decline to answer because i honestly believe my answer might tend to incriminate me. >> i thought only little girls giggled, mr. giancana. >> and then bobby has an unexpected visitor. despite his opposition to bobby's involvement, joe kennedy is finally endorsing his courageous son. >> when joe came and watched bobby perform, i think it was an extraordinary moment for joe in understanding that the runt of his litter, bobby, was as tough and as smart as he was. and for bobby, it was winning the paternal ac

she's also having an affair with bobby's longstanding nemesis, sam giancana, the chicago mafia boss.red that giancana and jfk were sharing a girlfriend. >> you just can't make it up. >> it was a very awkward thing to be saying to the attorney general you need to know your brother's been compromised. >> i mean, imagine, this is the president of the united states having an affair with this woman who is also involved with the head of the chicago mafia. it's a devastatingly dangerous thing for him to be doing. >> jack was vulnerable. he was somewhat reckless. he needed somebody to clean stuff up. >> bobby acts immediately to terminate his brother's relationship with judith campbell. >> the next day, the phone operator at the white house was instructed no more calls. he had cut off that relationship. >> the even bigger problem for bobby is how to deal with jack's old friend, frank sinatra. >> in the late winter of 1962, jfk was supposed to go to sinatra's house in palm springs to party with him. >> frank can't wait to have jack at his home. he even puts in secret service lines, you know,

to find out if giancana killed jfk. answer is no. >> bobby even wonders if america's own intelligence agency is to blame. >> he calls the head of the cia, john mccomb, to see m the cia did it, and mccomb swears to him as a fellow catholic the cia is innocent. >> asbobby searchesfor the truth behind jack's assassination, jackie plans for her husband's state funeral. >> the body of the late president john kennedy now lies in repose in the east room of the white house. the cameras are being allowed in at mrs. kennedy's specific request. >> jacqueline kennedy wanted to make sure that at the time and for all of history his death would have meaning and wanted to show that her husband was a martyr. >> she wanted the white house to be exactly as it was after president lincoln's assassination. so it was draped in heavy black fabric. the chandeliers were draped. it was a feeling of intense mourning. >> jack's father joe, confined to a wheelchair, is at home in hyannisport. >> he demanded that they go for a ride. because he was g