Trade Union play role in business firms by following ways : 

1. Protection : Trade union resist retrenchment of their members and help to ensure steady employment for workers. It safeguard workers against all sorts of exploitation by the employer and political parties. Union serve as a check on arbitrary action by employers. 

2. Representation : Trade union represent working class in various national and international forums such as Indian Labour Conference and International Labour Organisation. 

3. Sense of Belongingness : Trade unions generate a spirit of self respect and self-reliance among workers. A ordinary worker has little sense of belongingness in modem industry. He can gain social respect by joining a union. 

4. Participation : Trade unions work for achieving a better say of workers in the management of matters which directly influence the interests of workers. 

5. Education : Unions make workers conscious of their rights and duties and aware of the need for technological changes. Trade unions make arrangements for the education of workers and their family members.