Anton Kalvaa (1857–1922) was a Norwegian trade unionist and politician for the Labour Party.He joined the Labour Party in 1895. He served as a board member of the Norwegian Union of General Workers from 1902 to 1913, and was then hired as the Labour Party's secretary in Trondhjem.[1] The leading figure of an oppositional wing within the party, Martin Tranmæl was based in that city, and Kalvaa supported him in the "municipal tactic" question; both meant that the Labour Party should not compromise their ideology to attain practical goals.[2] In his heyday, Kalvaa was known as one of the most prolific and influential agitators of the trade union movement.