Please learn to read a history book before you go spouting nonsense. The LAW has violated the Constitution innumerable times.
Remember checks and balances? The courts have found many, many laws to be oppressive, unfair, unConstitutional, and just plain stupid.
And how is taking guns away from legally convicted felons uncounstitutional? Historically speaking, who is more likely to shoot someone, a person with a history of armed assault, or a farmer? How about a person who's only crime is robbing a bank, you would actually defend his right to go out and buy another gun?
I suppose you would be offended if a drunk driver who has had 2+ DUI convictions loses his drivers license? If you demonstrate the ability to misuse your freedoms, the freedoms will be taken away. And that is hardly uncounstitiutional.