Aspects of this topic are discussed in the following places at Britannica.
...a U.S. military commission in a former Confederate state could try a civilian for opposing those statutes. He dissented when the court invalidated, in Cummings v. Missouri and Ex parte Garland (both 1867), state and federal loyalty oaths prerequisite to the practice of learned professions. In various cases in 1872–73 (near the end of his life), in a court whose...
...of the United States has expanded the historical conception of attainder. It invoked these clauses in 1867 in Cummings v. Missouri and Ex parte Garland to strike down loyalty oaths passed after the American Civil War to disqualify Confederate sympathizers from practicing certain professions. Similarly, in...
in ex post facto law )...historic practice of passing laws to punish particular individuals because of their political beliefs. In 1867, in Cummings v. Missouri and Ex parte Garland, the United States Supreme Court condemned as both bills of attainder and ex post facto laws the passage of post-American Civil War loyalty-test oaths, which were designed to...
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