Based on an empirical study conducted with union representatives working in the private sector in Quebec (Canada), this article analyses how union representatives perceive strikes. The analysis of the interviews primarily shows that union representatives have strongly integrated the current constraints related to striking, whether they be of an economic, institutional or organizational nature or relating to the dynamics of mobilization involved therein. Second, it emphasizes that, in spite of the union representatives’ more ambiguous relationship with striking, strikes are still an important tool in the repertoire of union action. Lastly, it highlights the various changes in the way this union practice is implemented.