Now, with the fraud charges filed earlier this week against Sam Bankman-Fried, the founder of the bankrupt FTX exchange, Williams has further solidified his office's growing role in prosecuting financial crimes involving cryptocurrency, according to interviews with a half-dozen former prosecutors.
Bankman-Fried, 30, has acknowledged risk management failures at FTX but said he does not believe he has criminal liability.
In the wake of Bankman-Fried's arrest, Williams has made clear he would plow on with cryptocurrency enforcement.
On Wednesday, he announced wire fraud conspiracy charges against the founders of two separate cryptocurrency mining and trading companies he called Ponzi schemes.
On Tuesday, Williams told reporters more charges in the FTX probe were possible.