The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.
This amendment is the result of a major argument that occurred between the Federalists and the Anti-Federalists over the Bill of Rights. In short, the Federalists believed that by explicitly listing some rights that the government could not violate, the door was left wide open for the government to imply that any right not explicitly protected in the Constitution could be violated. Ultimately, the Anti-Federalists caved, hence the inclusion of this amendment.
Judicially, this amendment is generally regarded as protection against the expansion of governmental power via misconstruing the enumerated rights of the Constitution. However, the amendment does not protect against a legitimate expansion of governmental power, which the U.S. Supreme Court explained in United Public Workers v. Mitchell 330 U.S. 75 (1947):
If granted power is found, necessarily the objection of invasion of those rights, reserved by the Ninth and Tenth Amendments, must fail.
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