How do you get the omerta on your side in Fallout New Vegas?

Answer 1

The quest is activated after talking to Yes Man, once Bye Bye Love is complete, or started after a few tasks during For the Republic, Part 2. Inside the main entrance to the Gomorrah, talk to receptionist on your left. If it appears as a Speech option, ask her about "the outstanding balance" on information to find out what's been going on in Gomorrah. She will tell you to find Cachino, a low level lieutenant, and ask him about suspicious Omerta activities. If there is no "outstanding balance" speech option with the receptionist, ask a few of the dealers/bouncers/hookers about where you can find Cachino. They will all tell you to go away, but eventually Cachino will appear on the casino floor and talk to you. If you have the Terrifying Presence perk, you get a new speech option and they'll tell you to meet him in Brimestone. During For the Republic, Part 2, you will be asked to get some information regarding the Omertas by Colonel Moore. She will then tell the Courier to talk to Liza O'Malley to start this quest. The quest can also be given by Mick at Mick and Ralphs after asking him for work. He mentions that the Omertas have stopped buying guns from him without a word as to why.

Once the quest starts, you need to find proof of Cachino's work he's been pulling on the side. The Family doesn't know about this because it goes against Omerta rules, putting his life at risk if it ever gets out. There is a journal in his desk directly to the left in the bedroom of his suite and another on his person that can be pick pocketed, this is the evidence needed. You can get the key to his suite from the receptionist for 300 caps, passing a Strength check of 8 (making it free of charge) or a Barter skill check of 55 (lowering the bribe to 200 caps). Once you return to Cachino and tell him you have his journal, he will offer you 100 caps to get the journal back, or if you have Barter of 60, get an additional 200 caps for his "friendship." DON'T ACCEPT HIS OFFER

Inform the guard at the door to the Zoara Club that you have proof that one of their guys is dealing on the side, he will let you in to see the bosses. You can talk to Big Sal and offer him Cachino's Journal for 100 or 200 caps if you succeed in a Speech check. After that, everyone is brought into Big Sal's office for a meeting where Button Man will kill Cachino after he begs for his life. Talk to Big Sal afterwards, he'll ask you to take over for Cachino then offer you a job aiding Clanden and Troike in their plans.

For Clanden, it means helping him kill "a large amount of people in a short amount of time". If you have a high enough Science skill (60), you can persuade Clanden into making a Chlorine Bomb easily, otherwise Clanden will tell you what is needed. Chlorine can be stolen from the Ultra-Luxe casino, or purchased from Ralph in Freeside.

Troike will tell you that he is a gun smuggler and inform you that he needs someone to retrieve a crate of guns stolen by the Fiends. The location will be marked on your map, guarded by 4 Fiends. Once you retrieve the Disassembled Weapons Shipment, return to Troike.

Once the Chlorine is given to Clanden and the weapons to Troike, you will then be told to see Big Sal. Upon informing Big Sal of having fulfilled his request to aid Clanden and Troike, he awards you with 400 caps. You can also speak to him about 50 Gomorrah tokens. Choosing this solution will cause the player to lose fame with the strip, and during the Wild Card: Side Bets quest, a dialogue option will appear when talking to Yes Man saying that you support the Omerta's plans of attacking and taking over the strip.