The most dangerous thing, politically speaking, is an unaccountable center of political power. Allegedly the United States government is set up to prevent such a thing from happening. Congress has the power of impeachment of both the President and of Supreme Court justices. The Supreme Court has the power to nullify laws that were passed. The President has both enforcement power and veto power.
It is a nice theory, but does not work so well in practice. As it stands now, the congress has ceded almost all of its power to the other branches. What should be accomplished through legislation is instead accomplished by executive order or by judicial fiat. The only power that still remains with congress is that to pass a budget (or even a continuing resolution) and even that was attacked recently with the idea to mint a high denomination platinum coin.
The Department of Homeland Security, perhaps one of the most dangerous departments in the federal government, no longer submits to any sort of checks of authority. According to Infowars, Janet Napolitano is ignoring requests by members of congress to explain the large ammunition purchases by the Department of Homeland Security.
This follows but a few months after John Pistole, director of the TSA, declined to show at a congressional hearing. And this is not the first time that the leadership of the TSA has declined to show, setting rules for their participation that include not allowing critics of the TSA at the hearings.
There is very little accountability in the United States government. But blatant disregard of this magnitude is startlingly new. Only the quasi-independent Federal Reserve has ever been able to disregard the checks and balances up until this point. Moreover, the TSA has even retaliated against elected officials that dared to criticize the TSA. It is clear that in addition to controlling all entry and exit to the country, the DHA is setting itself far above the law.