Labor law (also called law or employment law) is the body of laws, administrative rulings, and precedents which address the legal rights of, and restrictions on, working people and their organizations. As such, it mediates many aspects of the relationship between trade unions, employers and employees. In Canada, employment laws related to unionized workplaces are differentiated from those relating to particular individuals. In most countries however, no such distinction is made. However, there are two broad categories of labor law. First, collective labor law relates to the tripartite relationship between employee, employer and union. Second, individual labor law concerns employees' rights at work and through the contract for work. The labor movement has been instrumental in the enacting of laws protecting labor rights in the 19th and 20th centuries. Labor rights have been integral to the social and economic development since the Industrial Revolution. Employment standards are social norms (in some cases also technicalstandards) for the minimum socially acceptable conditions under which employees or contractors will work. Government agencies (such as the former U.S. Employment Standards Administration) enforce employment standards codified by labor law (legislative, regulatory, or judicial).