Vault 114

“Before the war, Vault-Tec began construction of Vault 114 inside Boston's Park Street subway station. The project was never completed, but that matters little to the gangsters who have taken up residence there.” — Fallout 4 loading screen hint
Vault 114 is an unfinished Vault-Tec Vault in the Commonwealth, accessed by going through Park Street station. By 2287, Vault 114 had been taken over by mobster Skinny Malone and his crew of Triggermen.
Background Vault 114 was primarily intended to house Boston's upper class and their families. Only high-ranking members of local and state government, local luminaries, and business people were accepted as part of the social experiment. Future members of the Vault were also made aware that they would be cohabiting solely with others of similar wealth and power.
Even though the initial residents were of upper social status, the "luxury" aspect of the Vault was highly exaggerated to the future residents. Multiple families, chosen randomly, were to live and sleep in single-room apartments. Dining and bathing would be in shared quarters, and amenities would be minimal.
Vault 114 personnel interviewed individuals for the overseer position with the goal of finding someone with no supervisory or government experience and strong anti-authority bias. Human Resources indicated that the interview process had vetted many viable candidates for the position.
An overseer was chosen when the interview process dredged up a man known only as "Soup Can Harry." He refused to provide his legal name (which he referred to as a "rank and number" branded by the government), and believed the government used taxes to fund "Illuminati Free Mason sex parties." Soup Can was presumably homeless, as he implied that he slept in dumpsters. He also appears to have eaten Abraxo cleaner before, as he is recorded as saying "I seen the back of them Abraxo boxes. 'Not for consumption'? Don't you tell me what to do, I'll eat what I want!"
As Soup Can so perfectly exemplified what Vault-Tec desired in an overseer for this Vault, his interviewer offered him the position on the spot. Soup Can accepted, but cautioned that he "ain't wearing no goddamn tie... or pants." Vault 114 personnel were also told by Vault-Tec management not to "undermine the new overseer's authority at all during the experiment, even (and especially) if it may cause physical discomfort, embarrassment, or harm to residents." By taking away the luxury and authority these groups saw in surface life, while simultaneously subjecting them to the whims of a dangerously incompetent overseer, Vault-Tec hoped to study the residents' reactions in stressful situations.
By 2287, the Vault had been taken over by mobster Skinny Malone and his Triggermen.