The legality of secret laws

It’s been made clear from information provided by Edward Snowden that the U.S. government (G.W.Bush and Obama administrations) circumvents the Constitution by utilizing secret laws and secret interpretations (rules and regulatory outgrowths) of various laws to breach the civil liberties of anyone with a digital footprint (American or otherwise). My question is… Are secret laws Constitutional? If yes, it is time to amend the Constitution to outlaw secret laws.