solidarity

/ˌsɑlɪˈdɛrəti/
noun
  1. Unity or agreement of feeling or action, especially among individuals with a common interest; mutual support within a group.
    • In times of crisis, communities often express solidarity by helping their neighbors.
    • The international aid effort was a powerful display of solidarity with the disaster victims.
    • The workers showed solidarity by refusing to cross the picket line.