This article challenges the militant and industrial unionist version o
f British coal mining trade union history, surrounding the Miners' Fed
eration of Great Britain and the National Union of Mineworkers, by con
sidering, for the first time, the case of the colliery deputies' trade
union. Their national Federation was formed in 1910, and aimed to rep
resent the three branches of coal mining supervisory management: the d
eputy (or fireman, or examiner), overman and shotfirer. First, the art
icle discusses the treatment of moderate and craft traditions in Briti
sh coal mining historiography. Second, it shows how the position of de
puty was defined by changes in the underground labour process and the
legal regulation of the industry. Third, it traces the history of depu
ties' union organization up until nationalization in 1947, and the for
mation of the National Association of Colliery Overmen, Deputies and S
hotfirers (NACODS). The article concludes that the deputies represent
a mainstream tradition of craft/professional identity and industrial m
oderation, in both the coal industry and the wider labour movement.