Background
Mack was born in Wellington, New Zealand on 3 March 1867.
Mack was born in Wellington, New Zealand on 3 March 1867.
He was a railway guard and Secretary of the Amalgamated Society of Railway Servants (1908-1927). Mack stood as New Zealand Labour Party candidate for Parnell in 1911 but disliked the party"s stance on conscription in World War I. Mack was President of the Alliance of Labour in 1924.