The FBI used to be one of the main investigators of financial crimes, large scale frauds, etc.
We don't really prosecute those anymore, of course, so why bother.
*btw: pinkerton federalized??? huh?
A) Pinkerton still exists! I once had a background check from them for a new job, so I would imagine they are still busting unions at some level. Actually it looks like it has split into several pieces over the 163 years.
B) Wikipedia says the FBI's investigation methods were modeled after Pinkerton and another big detective agency, but says nothing about "federalizing" it.
**double btw: Didn't this fbi mission change happen like two years ago? I know I was depressed by it before.