This article examines the determinants of differences in militancy among the union workers involved in a faculty strike at Temple University in 1990. Three forms of strike-related militancy are investigated: voting to continue the strike, voting to defy a court injunction, and picketing and related strike-support activities. The results indicate that job attitudes, attitudes toward the union, the perceived instrumentality of striking, attitudes toward militancy, social support, and some demographic variables were related to at least one form of militancy examined. The three forms of militancy, however, had different determinants. For example, social support and union commitment were significantly related to the more risky and confrontational forms of militancy, but not to voting to continue a strike.