International Brotherhood of Electrical Workers records (1917) Collection includes three IBEW contracts with three different companies in the Butte area: Montana Power Company; Butte, Anaconda & Pacific Railway Company; and The Butte Electrica Railway Company (also includes agreement with Local Union 200). Contracts all created in the months following the Anaconda Mining Company Speculatro Mine Disaster, a time of much unrest between labor unions and companies in the Butte area.