John Michael Katko is an American attorney and politician who served as the U.S. representative for New York's 24th congressional district, based in Syracuse, from 2015 to 2023. A member of the Republican Party, he previously was an Assistant United States Attorney who led the organized crime division at the U.S. Attorney's Office in Syracuse. In that role, he helped to prosecute gang members under the Racketeer Influenced and Corrupt Organizations Act.

The Republican Party in the United States includes several factions, or wings. During the 19th century, Republican factions included the Half-Breeds, who supported civil service reform; the Radical Republicans, who advocated the immediate and total abolition of slavery, and later advocated civil rights for freed slaves during the Reconstruction era; and the Stalwarts, who supported machine politics.