He can be found in the Gomorrah casino, Lower Brimstone (through the double doors near the dance floor-unlocked using the Club Zoara Key). Troike has a fearful personality, very talkative yet too reluctant and cowardly to reveal any information about the Omerta Family; he is also a chem-addict framed for murder, as can be uncovered in the quest How Little We Know. He has a big network of contacts in the Mojave, and was framed by the Omertas and blackmailed into their employment because of this. Once the Courier contacts with Troike, he can either be freed from his contract or assisted by finding a missing shipment of weapons. If Troike is freed of his contract, you can obtain the Pimpboy 3-Billion. However, if you free Troike, he'll reveal what he does for the Omertas. Under Omerta contract, he uses his contacts to sneak weapons into Gomorrah using the monorail out of Camp McCarran. Although Troike reveals his "stroke of genius" while expressing this information, the realization is simply that the weapons are stored in crates marked as 'food' or 'medical' supplies and sorted out at LVB station from some crooked soldiers. Because of this plan, the Omertas have an extensive array of weapons stored in the basement, awaiting the Family's plan to possibly take over The Strip.
Although Troike comes off as a complete coward, it turns out he decided to make enough Thermite to destroy all of the Family's stored weapons and tampered with the light in the basement to produce enough of a spark to set it all off.