Neither are the FEDs going to manipulate the Market nor are they 'fighting' Bitcoin per se.
They simply are enforcing proper procedures. You can thank Mark K. & the rest of mtgox who didn't thought it necessary to do the paperwork which is required from them.
It is even possible they brought that up onto themselves by a high profile ad in the G8 magazine and nobody would have even bothered otherwise.
in retrospect:
