What group was concerned about the Constitution's provisions for the strength of the president and the lack of specific guarantees of civil liberties?

Anti-federalists

Explanation:

Anti-Federalism was concerned about the Constitution's provisions for the strength of the president and the lack of specific guarantees of civil liberties.

Anti - Federalism was a movement that opposed the creation of a stronger U. S. federal government and they were a diverse coalition of people who opposed ratification of the Constitution.

Some Anti-Federalists preferred a weak central government because they equated a strong government with British tyranny

because they feared that the new national government would be too powerful and thus threaten individual liberties, given the absence of a bill of rights.