swell mob
Webster's Dictionary (GCIDE)
Mob \Mob\, n. [L. mobile vulgus, the movable common people. See Mobile, n.]
1.The lower classes of a community; the populace, or the lowest part of it. [1913 Webster]
A cluster of mob were making themselves merry with their betters.— Addison.[1913 Webster]
2.Hence: A throng; a rabble; esp., an unlawful or riotous assembly; a disorderly crowd. [1913 Webster]
The mob of gentlemen who wrote with ease.— Pope.[1913 Webster]
Had every Athenian citizen been a Socrates, every Athenian assembly would still have been a mob.— Madison.[1913 Webster]
Confused by brainless mobs.— Tennyson.[1913 Webster]
3.A criminal organization or organized criminal gangs, collectively; the Mafia; the syndicate; as, he was a lawyer for the mob. [PJC]
Mob law, law administered by the mob; lynch law.
Swell mob, well dressed thieves and swindlers, regarded collectively. [Slang] --Dickens. [1913 Webster]
Swell \Swell\, a. Having the characteristics of a person of rank and importance; showy; dandified; distinguished; as, a swell person; a swell neighborhood. [Slang] [1913 Webster]