<span>legal authority to regulate the trade of Great Britain, and all her colonies</span>
No, because a PBS documemtary could not have witnessed something and retold it. It most likely is a secondary source, if they interviewed people who have witnessed the thing they are talking about.
To serve and protect the states
Because chief justice Marshall declared that slaves were not people, but we're property and there for had no right to sue in any way shape or form. This called for the fugitive slave act, which out raged abolitionist.