True, but you would hope that when unconstitutional laws are brought to court they would be struck down (results vary). For one of the odd cases which details

True, but you would hope that when unconstitutional laws are brought to court they would be struck down (results vary). For one of the odd cases which details the weird world of USPS laws passed by Congress, check out Postal Service v. Flamingo Industries which starts with claims of attempts to create a mail sack production monopoly and goes interaction complicated from there. I was not aware the USPS has the powers of eminent domain and to conclude international postal agreements.