About the film
Dionysus in 69 was a theatrical production directed and conceived by Richard Schechner, founder and longtime artistic director of the Performance Group (TPG), a New York-based experimental theater troupe. An adaptation of The Bacchae by Greek playwright Euripides, it was documented in a film by Brian de Palma, Bruce Joel Rubin, and Robert Fiore titled Dionysus in '69.
From the film's Wikipedia article (CC BY-SA 4.0).