What main reason did most anti-federalists opposed the constitution for?

Anti feds felt that the constitution gave the government too much power and later came to a compromise with the federalists that the constitution will only be ratified if a bill of rights was added.

The main arguments used by the Anti-Federalists in the debate for the U. S. Constitution were the fact that the Constitution gave too much power to the federal government and that the rights of the people were not guaranteed through a Bill of Rights.