Unionism is the policies and practices of labor unions. Labor unions were originally formed due to the economic and social impact of the industrial revolution. Lobbying is a common occurrence in labor unions, they seek to influence an issue involving their profession, interest, or unions in general. The sole purpose of unions is to protect and further the rights of workers in a trade or profession. Wages, benefits, job security, seniority, and working conditions are all examples of what is protected. 10-30% of labor union workers earn higher pay than nonunion specialized workers. Labor unions have jurisdiction to represent specialized workers. Examples of union workers includes city workers, government workers, teachers, police, mechanics,