Article 1 Section 2.
. . . . Representatives
and direct Taxes shall be apportioned among the several
States which may be included within this Union, according to
their respective Numbers, which shall be determined by
adding to the whole Number of free Persons, including those
bound to Service for a Term of Years, and excluding Indians
not taxed, three fifths of all other Persons. (The
previous sentence in parentheses was superseded by Amendment
XIV, section 2.) . . .
Article 1, Section 9, Clause 1
. . . . The Migration or Importation of such Persons as
any of the States now existing shall think proper to admit,
shall not be prohibited by the Congress prior to the Year
one thousand eight hundred and eight, but a tax or duty may
be imposed on such Importation, not exceeding ten dollars
for each Person. . . .
Article 4, Section 2.
. . .No Person held to Service or Labour in one State,
under the Laws thereof, escaping into another, shall, in
Consequence of any Law or Regulation therein, be discharged
from such Service or Labour, But shall be delivered up on
Claim of the Party to whom such Service or Labour may be
due.. . .