The US Consumer Product Safety Commission has a good educational video about importers and exporters responsibilities when consumer products enter the US.
Under the Consumer Product Safety Act, the term “manufacturer” is defined to include any person who imports a consumer product. Importers are directly responsible for the safety of products they bring into the United States.
Maintaining import compliance with these regulations is key to ensure products can safely enter the country, and ensure that there will be no ill effects afterwards such as recalls or health problems for the consumer.
The video goes into detail on what importers are responsible for and what agencies control these issues.
Visit the US Consumer Product Safety Commission to view the video or read a transcript.

