Overview
The fugitive slave laws were laws passed by the United States Congress in 1793 and 1850 to provide for the return of enslaved people who escaped from one state into another state or territory. The idea of the fugitive slave law was derived from the Fugitive Slave Clause which is in the United States Constitution (Article IV, Section 2, Paragraph 3). It was thought that forcing states to deliver fugitive slaves back to enslavement violated states' rights due to state sovereignty and was believed that seizing state property should not be left up to the states. The Fugitive Slave Clause states that fugitive slaves "shall be delivered up on Claim of the Party to whom such Service or Labour may be due", which abridged state rights because forcing people back into slavery was a form of retrieving private property. The Compromise of 1850 entailed a series of laws that allowed slavery in the new territories and forced officials in free states to give a hearing to slave-owners without a jury.
Pre-colonial and colonial eras
The New England Articles of Confederation of 1643 contained a clause that provided for the forced re-enslavement of free blacks. However, this only referred to the confederation of colonies of Massachusetts, Plymouth, Connecticut, and New Haven, and was unrelated to the Articles of Confederation of the United States formed after the Declaration of Independence. Both Africans and Native Americans were enslaved in New England beginning in the 18th century. The Articles for the New England Confederation provided for the forced re-enslavement of free people in Section 8:
As the colonies expanded with waves of settlers pushing westward, slavery went along with them, prompting further legislation of a similar nature. Serious attempts at formulating a uniform policy for the forced re-enslavement of free people began under the Articles of Confederation of the United States in 1785.
From Wikipedia (CC BY-SA 4.0).