The point is not to downplay the importance of union solidarity, which
is, of course, absolutely vital to any successful labor struggle. It is important to acknowledge, however, that union solidarity should not be celebrated merely because of its occurrence. Rather, what must be emphasized are the potential positive benefits that can accrue as a result of workers’ cooperation. This means that when certain types of solidaristic actions fail to bring about the desired goals, they should be abandoned and alternative forms of union solidarity should be implemented, if at all possible.
Devinatz, Victor G., "Union Solidarity, Collective Struggle and the Caterpillar Labor Dispute, 1991-1998" (2010). Faculty Publications-- Management and Quantitative Methods. Paper 4.