A Group of people mostly itillians (I am not racist I am full itillian) who use rackets to sell illegal services such as drugs, boose, prostition, and gambling. The mafia can also pay off cops and citizens. The Mafia has different status from dons and mob bosses to outsiders and assciotes. The mafia was at it's high point earlier in the 1900's. The Mafia would kill or "whack" someone who pays some threat to the family.
Good mafia movies Casino, Goodfellas, Godfather, Scarface, Heat