This ‘change’ bugs me, but John Hudson summarizes the likely reason nicely:

In many ways, the agency had no choice but to de-emphasize white-collar crime. Following the 9/11 attacks, the FBI picked up scores of new responsibilities related to terrorism and counterintelligence while maintaining a finite amount of resources. What’s not in question is that government agencies tend to benefit in numerous ways when considered critical to national security as opposed to law enforcement. “If you tie yourself to national security, you get funding and you get exemptions on disclosure cases,” said McClanahan. “You get all the wonderful arguments about how if you don’t get your way, buildings will blow up and the country will be less safe.”

Posted by Ben Brooks