<Li> The National Labor Relations Board (NLRB) administers the principal United States labor law, the National Labor Relations Act . The board is vested with the power to prevent or remedy unfair labor practices and to safeguard employees' rights to organize and determine through elections whether to have a union as their bargaining representative . </Li> <Li> The National Transportation Safety Board (NTSB) is responsible for civil transportation accident investigation in the US . The NTSB investigates and reports on aviation accidents and incidents, certain types of highway crashes, ship and marine accidents, pipeline incidents, and railroad accidents . </Li> <Li> The Nuclear Regulatory Commission (NRC) was established by the Energy Reorganization Act of 1974 from the United States Atomic Energy Commission, and opened January 19, 1975 . The NRC oversees reactor safety and security, reactor licensing and renewal, radioactive material safety, and spent fuel management (storage, security, recycling, and disposal). </Li> <Li> The National Science Foundation (NSF) supports fundamental research and education in all the non-medical fields of science and engineering . </Li>

How are independent executive agency different from cabinet executive agencies