Secrecy is another tool. The real keystones are the implied use of imprisonment, violence and death, if you don't obey. When a government no longer abides by

Secrecy is another tool. The real keystones are the implied use of imprisonment, violence and death, if you don't obey. When a government no longer abides by their constitutional oath (if they have one) and does not respect the people it is supposed to represent, then you will have tyranny.