Final answer:
The guard mentioned likely refers to the system of checks and balances, outlined in the first three Articles of the Constitution, or the Bill of Rights, which protects individual freedoms.
Step-by-step explanation:
The question is seeking to understand where in the Constitution a certain 'guard' is mentioned. If referring to the system of checks and balances or the division of powers within the federal government, these concepts are detailed within the first three Articles of the Constitution. The Preamble of the Constitution lays out the foundational goals of the government, while Article I defines the Legislative branch, Article II defines the Executive branch, and Article III defines the Judicial branch. Additionally, the Bill of Rights, consisting of the first ten amendments, provides additional protections against government overreach into individual freedoms.