Those liberties are restricted, justly, when one violates a law. Setting aside the perfectly reasonable outrage at mass surveillance techniques, the ACLU seems

Those liberties are restricted, justly, when one violates a law. Setting aside the perfectly reasonable outrage at mass surveillance techniques, the ACLU seems to have a problem with any border enforcement, including the kind of temporary detainment that is a requirement for any kind of justice system to function! Civil liberties do not include the right to enter another sovereign country without that country's consent, so yes, the liberty of free movement into and within a country is something that citizens and legal residents have that other people do not. This is not a simple problem that lends itself well to the kind of pithy soundbites I complained about in the OP.