Labor unions used collective bargaining and strikes to attempt to improve working conditions for workers. Through collective bargaining, unions would negotiate with employers to reach agreements on issues like wages, hours, and safety conditions. If negotiations failed, unions would call strikes as a tactic to put pressure on employers. However, early strikes were often met with violence from employers, police, and use of federal troops. Over time, unions continued to organize and use strikes to gain bargaining power and protections, such as the Wagner Act which legally protected the right to unionize.