Andrew Humphreys was a U.S. Representative from Bloomfield, Greene County, Indiana, who served in the Forty-fourth Congress. Prior to the American Civil War, Humphreys was as a member of the Indiana House of Representatives, and an Indian agent for Utah. In 1864 Humphreys was a defendant in a controversial trial by a military commission that convened on October 21 at Indianapolis, where he and three others were convicted of treason. Humphreys was sentenced to hard labor for the remainder of the war, but the sentence was modified three weeks later to allow for his release. At the end of the war, Humphreys resumed a career in politics, which included terms in Forty-fourth Congress and the Indiana Senate.

Lambdin Purdy Milligan was an American lawyer and farmer who was the subject of Ex parte Milligan 71 U.S. 2 (1866), a landmark case by the Supreme Court of the United States. He was known for his extreme opinions on states' rights and his opposition to the Lincoln administration's conduct of the American Civil War.