Some subject search terms to try in SOLO
Most consitutional courts have their own website with accessible databases of decisions. Some also provide (unofficial) English translations of their leading cases.
In addition, the Council of Europe's Venice Commission monitors constitutional developments world-wide (not just members of the CoE) and makes results available free online:
In this case, the US Supreme Court (in a judgment delivered by Chief Justice John Marshall) ruled that it was not bound by an act of Congress that was "repugnant to the Constitution."