(also known as The Radical) is a 1975 American TV movie written and directed by Jeremy Kagan, and starring Sissy Spacek, Art Carney and Henry Winkler. Intended to portray the time period of the Vietnam War, the title character was loosely based on Diana Oughton of the Weather Underground, who died in the 1970 Greenwich Village townhouse explosion when a bomb she was building accidentally exploded.
Katherine originally aired in a two-hour time slot on October 5, 1975, and later was syndicated in a 78-minute version.