HazCom is the law, employees have the right to know about chemicals they are exposed to in the workplace.
The AFSCME (American Federation of State, County and Municipal Employees) provides a good description of workers' rights protected under the HazCom Right To Know legislation in the article paraphrased below.
The Right-to-Know refers to workers' rights to information about chemicals in their workplaces. The federal law that provides these rights is the OSHA Hazard Communication Standard (29 CFR 1910.1200). Private-sector employers must provide chemical information to their workers under the OSHA standard.
Right-to-Know laws give workers the right to know about dangerous chemicals at work. You have rights to get information about chemicals in four main ways.
View the entire article here: Right-to-Know Laws and Rights
Although workers' rights are protected federally under the EPA, states regulate workers' rights independently. Regulations vary significantly between states. Workers should research state specific Right To Know information from their local EPA.