The project manager's leadership style should be matched to the corresponding developmental level of the project team and should move through successive steps in the following order

Industrial relations or employment relations is the multidisciplinary academic field that studies the employment relationship; that is, the complex interrelations between employers and employees, labor/trade unions, employer organizations, and the state. (Source: Wikipedia)

Good examples of industrial relations are: Union organizing, collective bargaining and strikes. These three actions involve active participation of both organized labor and management.