I have had the opportunity in my life to intervene and challenge two witch hunts, one in the 1970's against "those long-haired pinko hippie student protestors at Kent State" and another in the 1980's at Yale and in America-at-large against "those fags who spread AIDS" (link) when American society believed AIDS could not be acquired and transmitted heterosexually.
See the televised segments below.
0 to 4 min and 41 seconds:
Christmas Story on CBS Evening News, 1972: Challenging the witch hunt against Kent State students.
4 min 42 seconds to end:
60 Minutes segment: Challenging the witch hunt against people with AIDS.
PROSTITUTE BELIEVED TO HAVE AIDS SURRENDERS, IS JAILED *
The Miami Herald - Feb 28, 1984
THE REGION; Escapee Gives Up*
nytimes.com - Feb 28, 1984