Send in the regular Army and the cattle-cars, and let the roundup begin. Seize all their belongings and assets and sell them off to fund said roundup and pay down the national debt.
Oddly enough; I have already created a detailed design for an automated processing facility to be constructed on the Dugway Proving Grounds.
Does not require guards.
Completely computerized.
Requires automated rail system with bottom dump railcars.
Finished product can be bagged and used as a soil amendment.
System can be operated from a single SECURE server.
System does require bi-annual maintenance.
I know what your thinking, but somebody does have to consider the technological problems of automated waste disposal.