With death threats a part of her weekly routine at the clinic she runs in New York City, Merle Hoffman has been fighting a passionate, perilous battle since the early 1970s. “The only woman who owns a licensed ambulatory surgery center specializing in abortion and reproductive care in New York State” — as she has described herself — will share stories from her book, “Intimate Wars: The Life and Times of the Woman Who Brought Abortion From the Back Alley to the Boardroom,” at BookHampton on East Hampton’s Main Street on Saturday evening at 5.