How does the Constitution directly protect the institution of slavery?

There was one clause in the original Constitution that required cooperation with slaveholders and protected the institution of slavery. Slaves who escaped to freedom were to “be delivered up” to their masters (Article IV, Section 2, Clause 3). ... In no way can the Constitution be said to be pro-slavery

Explanation:

the us hoped to prevent any nations from leaning towards soviet union-based communism. the containment policy was established in hopes of keeping communism from spreading to new places.