The case of United States ex rel. Johnson v. Shaughnessy, Acting District Director of Immigration and Naturalization in 1948 revolved around the issue of deportation under immigration law. The petitioner, a British citizen who had served in the U.S military during World War II was ordered to be deported due to his involvement in criminal activities (specifically larceny) prior to his enlistment. He argued that he should not be deported because he had been honorably discharged from the military and thus earned exemption from deportation according to an act passed by Congress which protected veterans from being expelled for crimes committed before their service period. However, this argument was rejected by both lower courts and eventually by the Supreme Court as well on grounds that such protection only applied if they enlisted while residing within U.S territory or possessions - something Mr.Johnson did not do since he enlisted while outside these areas.

In the dissenting opinion for United States ex rel. Johnson v. Shaughnessy, Justice Jackson disagreed with the majority's ruling that a non-citizen could be deported without a hearing on the grounds of national security. He argued that this decision violated basic principles of due process and fairness, as it allowed individuals to be expelled from the country based solely on secret evidence they were not permitted to see or challenge. Furthermore, he contended that such an approach was inconsistent with American values and traditions, which emphasize transparency and accountability in government actions. In his view, allowing deportation without a fair hearing undermined these ideals by giving too much power to immigration officials while leaving those affected by their decisions with little recourse or protection under law.