I'm pretty sure Federal crimes were almost non-existent in the 18th Century. The "Federal prosecutors" were U.S. Attorneys whose primary responsibility was to represent the United States of America in
civil proceedings, not criminal cases. I suspect their primary role was in negotiating land deals with states and overseeing legal proceedings as new states were admitted to the Union.
Federal crimes were probably limited to piracy on the high seas (which would be outside the jurisdiction of any state), and Federal tax evasion.
The U.S. Department of Justice didn't even exist until 1870.
I see that you got my mockery of the Just-Us clowns running our Jesters System...
Theres just-us in the US. Just us peasants go to jail.