The most concerning thing about this is that these people aren't just being deported, they are being sent to an extremely harsh prison in an unrelated 3rd party country, all without due process. Can we send people to Siberia now too?
The Venezuelan gangs are a problem and need to be dealt with, but why can't we deal with it in accordance with our laws? If one's a criminal, then try and convict them. If someone is illegal and hasn't committed any other crime, then deport them back to their country.
To round people up and send them to some crazy max security prison in El Salvador is pretty nuts when you think about concerns about abuse of federal power the framers like Madison had when they created the Bill of Rights.