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The Breccia is a Troll crime syndicate in Ankh-Morpork, led by Chrysoprase the troll. It is much like any crime syndicate you might expect, thanks to the narrative force on the Disc, only it is run by trolls, so it is not a well-organized organized crime association. It is also quite violent.

In The Light Fantastic, Breccia (troll) is the name of an actual troll, who is introduced at about the same time as Chrysoprase (called Krysoprase at the time). It's possible the crime syndicate is named after that Breccia.

The civic association for trolls, the Silicon Anti-Defamation League, is sometimes rumored to be a front for the Breccia. There is little or no evidence to this, and Breccia itself is not well-organized, so it is unlikely that somebody will succeed in putting up a front, and Chrysoprase is widely known as a mobster, not a civic leader or businessman or head of charity organization....

The Breccia sometimes meet in the Pork Futures Warehouse, so that in its cold atmosphere they can think or negotiate faster than usual.

Annotation

The Breccia is a reference to the Roundworld's Mafia, a crime organization. The name Breccia comes from a type of rock found on Roundworld, which is composed of many separate rocks held together by a natural cement. The analogy is that the various Trolls that compose the Breccia are all held together by a general unwillingness to stick to the letter, and often the spirit, of the law.