Castro simply labeled individuals who ran afoul of his regime "criminals."
Plus, many of those interned in insane asylums were political prisoners.
Contrast that with the flotsam that washes up on our shores from the Rio Grande on a regular basis.
I'm waiting for the year when the Congress decides to impose a zero percent quota on immigrants from Mexico, and retroactively deports every Mexican who was given an amnesty under previous administrations.
Doubtfully possible, under our Constitution.
Ex post facto and all that.