The Unconstitutional reference article from the English Wikipedia on 24-Jul-2004
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Unconstitutional

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When something is unconstitutional it is illegal by being a direct violation of a nation's constitution.

A constitutional violation is thus somewhat different than the breaking of a normal law, both in terms of seriousness and punishment. Laws can be declared unconstitutional, though this causes no punishment for those who passed the laws. In many states the supreme court or constitutional court is the final arbiter of whether or not a law is constitutional.

Some examples of unconstitutional actions can be:

Most constitutions define the powers of governments. Thus the constitution normally applies only to government actions. This means that only governments can violate the nation's constitution.