Only in a theoretical context because there is no written 'moral law' that governs actions in society
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The Rule of Law was made its supreme maxim.
the plan of the government for the united states the supreme law of the land
No the Congress can not nullify a ruling of the Supreme Court. The Congress would have to rewrite the law which the Supreme Court had declared unconstitutional. Then the new law could overrule the Supreme Court IF the new law was declared constitutional if/when appealed.
That depends on whether you're talking about civil rights or labor law. The US Supreme Court interpreted the constitution to favor whites over African-Americans, and Industryover labor.
It allowed the Supreme Court to overrule an unconstitutional law.