Under which authority does the Coast Guard perform its duties related to customs laws?

The Coast Guard operates under a specific legal framework that allows it to enforce customs laws, and this is established in 14 USC 143. This section grants the Coast Guard the authority to carry out various law enforcement duties related to customs and immigration, thereby ensuring maritime security and compliance with U.S. laws. The power includes the ability to board vessels, inspect cargo, and conduct investigations to enforce customs regulations. This authority is crucial for the Coast Guard's role in protecting American interests by preventing smuggling and other illegal activities in maritime environments.

The other sections mentioned do not grant the specific authority needed to enforce customs laws. While those sections may pertain to different functions of the Coast Guard or general powers, 14 USC 143 explicitly addresses its customs enforcement capabilities, making it the appropriate choice for this question.