There was also the Women's Trade Union League, founded in 1903, and the American Federation of Labor, founded in 1886.
Eg, it says "labor leader Joe Hill was arrested", but doesn't say why that's notable.
It says there was labor unrest, and thousands of strikes by workers who wanted higher wages and an 8-hour work day, but doesn't mention that the labor movement had been pushing for an 8 hour day/48 hour week for decades.
(See http://bportlibrary.org/hc/bridgeport-at-war/strikes-for-the... for a description of the Bridgeport strike, which does mention the unions, and strikes by non-unionized workers.)
It never mentions the name of a union. But it does mention the fraternal organizations "Freemasons, the Knights of Columbus, Rotary, and the Elks, ... and the Kiwanis Club".