Which leader refused to attend the constitutional convention out of concern that its efforts could be a threat to liberty?

Patrick Henry.

Explanation: Patrick Henry was invited to participare in a constitutional convention in 1787. However, he refused to attend because he believed that there was a plot behind the invitation to make up a strong centralized government.

Henry was also a critic of the new Constitution which was sent to Virginia for ratification in 1788 because it did not include a bill of rights.

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