Robert F. Kennedy Jr. , an anti-vaccine activist and environmentalist, for years gained a loyal and fierce following with his biting condemnations of how the nation's public health agencies do business.
And that's put him on a direct collision course with some of the 80,000 scientists, researchers, doctors and other officials who work for the Department of Health and Human Services, especially with President-elect Donald Trump tapping him to head the agency .
If confirmed, Kennedy will control the world's largest public health agency, and its 1.7 trillion budget.
The agency's reach is massive. It provides health insurance for nearly half of the country - poor, disabled and older Americans. It oversees research of vaccines, diseases and cures. It regulates the medications found in medicine cabinets and inspects the foods that end up in cupboards.
A look at Kennedy's comments about some of the agencies that fall within the HHS arena, and how he has said he plans to shake them up
