Wen Ho Lee was a man who worked at a laboratory in the United States. He was accused of spying and giving secret information to a different country. The people who accused him thought he was helping them make nuclear weapons, which is very dangerous because nuclear weapons can cause a lot of damage.
However, later it was found out that he was not really helping anyone make nuclear weapons. The government was not actually able to prove that he did anything wrong. So, some people think Wen Ho Lee was just accused of something he did not do.
But, because of the accusations, Wen Ho Lee lost his job and was treated unfairly. This made a lot of people angry because everyone should be treated fairly in the United States, especially if they have not done anything wrong.