"Protectors of the Plot Continuum". They hate Mary-Sues, and the Mary-Sues' authors hate them right back. But they don't care, because they're literate and talented, and many of the Suethors are of the "omg ur soooo m33n" sort.
Basically, a PPCer makes up a character (or Agent), whom they write travelling into bad
fanfiction and killing the Mary-Sues, occasionally with a spork. Then the agent goes back into PPC HQ and drinks bleepka. The PPC is divided into two sections, which themselves consist of several different departments.
One section, Action, controls the actual
operations. It contains departments such as Mary-Sues, Bad Slash, Implausible Crossovers, and so on. The other section,
Infrastructure, deals with matters closer to home, including the departments Medical and Sufficiently Advanced
Technology, and the PPC general store and cafeteria.
There is also a mysterious department known as the DIO. The DIO does not exist. Nor does it police the PPC itself. It most certainly was not founded in the ruins of the DIS, which was gotten rid of towards the end of the period of the PPC’s history known as the Reorganization.
Each department is headed by one of the Flowers that Be, and the PPC as a whole is governed by the Sunflower Official. He is a sunflower in a smart suit.
It's all very amusing and fun, despite the odd troll or screaming hissy fit, and some Suethors even improve after getting con crit from a PPCer.
Fanfiction.net,
otherwise known as ‘the Pit of Voles’, seems to have a rule against PPCings. The mods there have no sense of fun.