Final answer:
The issue at hand during the Uruguay round of GATT was related to the U.S.'s enforcement of anti-dumping laws, leading to a 63% dumping margin against Japanese flat-panel displays to protect U.S. companies.
Step-by-step explanation:
The concern raised during the Uruguay round of GATT negotiations towards the U.S. Commerce Department's rulings was related to anti-dumping laws. Anti-dumping is when a country's producers sell goods in another country at less than fair value, which can hinder competition in the importing country. This practice is not allowed under WTO rules, and countries can impose duties on such goods to bring their prices up to what would be considered the cost of production, thereby protecting domestic industries. The U.S. imposed a 63% dumping margin on the import of flat-panel displays from Japan due to such a dumping complaint, an action involving both trade protectionism and the national interest argument, aiming to protect the U.S. market and companies.