He's presumably referring to the contract killings Ross Ulbricht is alleged to have tried to arrange.
This charge was dropped.
In my opinion, it was a baseless charge in the first place, meant to poison the well against Ross.
It wasn't dropped, I wish people would stop parroting that line. He was indicted in two separate jurisdictions, NY and Maryland. Maryland indicted him for 'Planned Violence' which includes one count of murder for hire. The NY charges are the ones that he's currently facing, the Maryland charges are still in the wings.