I must yet again point to a company like Endgame Systems[1] as being a likely contractor for this service rendered for the FBI.
Some of Endgame's products used by the likes of the NSA:
"There are even target packs for democratic countries in Europe and other U.S. allies. Maui (product names tend toward alluring warm-weather locales) is a package of 25 zero-day exploits that runs clients $2.5 million a year. The Cayman botnet-analytics package gets you access to a database of Internet addresses, organization names, and worm types for hundreds of millions of infected computers, and costs $1.5 million."
Exploiting an unknowable amount of users of a service as to hunt them. Using illegally harvested data from botnets, while others get hunted and prosecuted for coding them.
This tiered society where the legally immune can profit off acts that get others jailed. The market manipulation that comes with bribing companies for data access, the government giving less regulatory oversight to companies it has secret 'deals' with.
For the sake of society, economy, basic morality. It must end.
[1] http://wiki.echelon2.org/wiki/Endgame_Systems