The union soldiered on for another seventeen years, finding itself increasingly outmatched in its battles with employers. While it defeated all of the Steelworkers' efforts to replace it in its western strongholds in the 1950s, it had a harder time holding on to its outposts in the South. In addition, more conservative members, uneasy with the union's foreign policy and with the increasing number of African-American and Mexican-American unionists, tried to take their locals out of the union, opening up fissures that weakened the union's strikes against the Anaconda Copper Mining Company in 1954 and 1959. The union eventually merged with the Steelworkers in 1967 after losing locals to it in Butte and Canada. Only Local 598 in Sudbury, Ontario, which had a contentious and sometimes violent history with the city's Steelworkers locals, voted against the merger – it remained autonomous until 1993, when it merged with the Canadian Auto Workers.