brotherhood

(noun) the kinship relation between a male offspring and the siblings.

(noun) people engaged in a particular occupation. Synonyms: fraternity, sodality. Example: "The medical fraternity."

(noun) the feeling that men should treat one another like brothers.

(noun) an organization of employees formed to bargain with the employer. Synonyms: union, labor union, trade union, trades union. Example: "You have to join the union in order to get a job."