When a person is convicted of a federal crime, especially in a fraud case, but in lots of other kinds of federal criminal cases too, the district court sometimes also orders that the person pay restitution.
The point of restitution is that the person has to pay back any money that they took – they have to make any victims of the crime whole again.
To satisfy a restitution judgment, the federal government can go try to get that money from assets that a person has – they can go after bank accounts and retirement accounts and houses.