In March 1892, Taft resigned as Solicitor General to resume his judicial career.[20]

Federal judge
Taft's federal judgeship was a lifetime appointment, and one from which promotion to the Supreme Court might come. Taft's older half-brother Charles, successful in business, supplemented Taft's government salary, allowing William and Nellie Taft and their family to live in comfort. Taft's duties involved hearing trials in the circuit, which included Ohio, Michigan, Kentucky, and Tennessee, and participating with Supreme Court Justice John Marshall Harlan, the circuit justice, and judges of the Sixth Circuit in hearing appeals. Taft spent these years, from 1892 to 1900, in personal and professional contentment.[21]
According to historian Louis L. Gould, "while Taft shared the fears about social unrest that dominated the middle classes during the 1890s, he was not as conservative as his critics believed. He supported the right of labor to organize and strike, and he ruled against employers in several negligence cases."[2] Among these was Voight v. Baltimore & Ohio Southwestern Railway Co.[d] Taft's decision for a worker injured in a railway accident violated the contemporary doctrine of liberty of contract, and he was reversed by the Supreme Court.