Zero Fail: The Rise and Fall of the Secret Service by Carol Leonnig:
A sprite of a woman—115-pound, twenty-six-year-old, auburn-haired Lynette Fromme—was standing in the throng gathered outside. With a tiny voice to match her frame, she had been nicknamed Squeaky. One of the earliest and most devoted followers of Charles Manson’s violent “family” cult, she had come that day for a different purpose than waving at the president. She stood on the park path outside the Senator Hotel with hopes of delivering a message to politicians who weren’t stopping the pollution that was killing animals and plants. She wore a ruby-red cape with the hood over her head, and a .45 caliber pistol in a holster strapped to her ankle.