Final answer:
The responsible organization for checking the correctness of the shipper's naming, labeling, and marking of hazardous materials shipment is the United States Department of Transportation (DOT).
Step-by-step explanation:
In the context of hazardous materials shipment, the responsibility for checking that the shipper correctly names, labels, and marks the shipment lies with the United States Department of Transportation (DOT). The DOT has established regulations that govern the safe transportation of hazardous materials, including requirements for proper identification, labeling, and marking. These regulations help to ensure the safety of both the shippers and those involved in the transportation and handling of hazardous materials.