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http://www.digitalhistory.uh.edu/disp_textbook.cfm?smtID=2&psid=3241
The word "slave" does not appear in the Constitution. The framers consciously avoided the word, recognizing that it would sully the document. Nevertheless, slavery received important protections in the Constitution. The notorious Three-fifths clause--which counted three-fifths of the slave population in apportioning representation--gave the South extra representation in the House and extra votes in the Electoral College. Thomas Jefferson would have lost the election of 1800 if not for the Three-fifths compromise. The Constitution also prohibited Congress from outlawing the Atlantic slave trade for twenty years. A fugitive slave clause required the return of runaway slaves to their owners. The Constitution gave the federal government the power to put down domestic rebellions, including slave insurrections.