Brownlow was nominated for governor by a convention of Tennessee Unionists in January 1865. He was the only nominee. This convention also submitted state constitutional amendments outlawing slavery and repealing the Ordinance of Secession, thus making his state the first of the Southern states to leave the Confederacy. The military Governor Andrew Johnson had enacted a series of measures that essentially prevented ex-Confederates from voting, and on March 4 Brownlow was elected by a 23,352 to 35 vote, and the amendments passed by a similarly lopsided margin. He was sworn in on April 5 and submitted the
13th Amendment for ratification the following day. The Radicals nominated Brownlow for a second term for governor in February 1867. His opponent was
Emerson Etheridge, a frequent critic of the Brownlow administration. The legislature passed a bill giving the state's black residents the right to vote, and
Union Leagues were organized to help freed slaves in this process. Members of these leagues frequently clashed with disfranchised ex-Confederates, including members of the burgeoning
Ku Klux Klan, and Brownlow organized a state guard, led by General
Joseph Alexander Cooper, to protect voters (and harass the opposition). The
William G. Brownlow Family Papers, 1836-1900, archived by the Tennessee Secretary of State, contains one letter dated July 4, 1868, from the Great-Grand Cyclops of the Ku Klux Klan Stella Morton, in which Morton threatens Governor Brownlow's life. In an interview with the
Cincinnati Commercial, Forrest stated, "I have never recognized the present government in Tennessee as having any legal existence." He objected to Brownlow calling out the militia and warned if they "committed outrages...they and Mr. Brownloe's government will be swept out of existence not a Radical will be left alive." Forrest claimed the Klan had more than 40,000 members in Tennessee and 550,000 in the southern states. He said the Klan supported the Democratic Party. Forrest suggested that a proclamation of Brownlow called for shooting members of the Klan. Forrest denied being a member of the Klan himself. Forrest and twelve other Klan members submitted a petition to Brownlow, stating they would cease their activities if Confederates were given the right to vote. Brownlow rejected this, however, and set about reorganizing the state guard and pressing the legislature for still greater enforcement powers. Brownlow endorsed
Ulysses S. Grant for president in 1868 and asked for federal troops to be stationed in 21 Tennessee counties to counter rising Klan activity. The state legislature granted him the power to throw out entire counties' voter registrations if he thought they included disfranchised voters. In October 1868, prior to the election, Brownlow discarded all registered voters in
Lincoln County. Following the election, two of the Radicals' congressional candidates,
Lewis Tillman in the
4th District and
William J. Smith in the
8th District, were initially defeated. Brownlow, believing Klan intimidation to be the reason for their defeat, rejected the votes from
Marshall and
Coffee counties, allowing Tillman to win, and rejected the votes from
Fayette and
Tipton counties, allowing Smith to win. In February 1869, as Brownlow's final term was near its end, he placed nine counties under
martial law, arguing this was necessary to quell rising Klan violence. He also dispatched five state guard companies to occupy
Pulaski, where the Klan had been founded. After Brownlow left office in March, Forrest ordered the Klan to destroy its costumes and cease all activities. ==U.S. Senate and later life==