Robert F. Kennedy, Jr., left, stands with protesters at the Capitol in Olympia, Wash., on Feb. 8, 2019, where they opposed a bill to tighten measles, mumps and rubella vaccine requirements for school-aged children. He carved out a career as a bestselling author and top environmental lawyer fighting for important public health priorities such as clean water. His work as a leading voice in that movement likely would have been his legacy, but more than 15 years ago, he became fixated on a belief that vaccines are not safe, despite overwhelming scientific consensus that they are. (AP Photo/Ted S. Warren, File)
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