Why were some people im the north opposed to the fugitive slave law?

legal rights and freedom of speech.i hope that it is correct.

brainliest if correct

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.