Answer: To limit the power of the federal government.
Explanation:
The bill of rights list out the vital rights of the citizen. There was a support for the bill of rights by the Anti Federalist as they believe that it'll checkmate the activities and power that the Federal government possess.
Without the bill of right, there may be an abuse of power by the Federal government and hence the Anti-Federalists support it to curtail the power of the Fed.