 UMWA struck when the national contract expired on December 6, 1977.As the bargaining talks continued in December, sporadic violence broke out.A coal auger was blown up at a mine near Saint Charles, Georgia, a coal train was stopped and delayed in Cambria County, Pennsylvania, and in Utah a state judge issued a 10-day restraining order against the union and 1,100 summonses issued after replacement miners complained of being harassed by picketers.