Dario Luigi Angelo Fo was an Italian playwright, actor, theatre director, stage designer, songwriter, political campaigner for the Italian left wing and the recipient of the 1997 Nobel Prize in Literature. In his time he was "arguably the most widely performed contemporary playwright in world theatre". Much of his dramatic work depends on improvisation and comprises the recovery of "illegitimate" forms of theatre, such as those performed by giullari and, more famously, the ancient Italian style of commedia dell'arte.

Accidental Death of an Anarchist is a play by Italian playwright Dario Fo that premiered in 1970. It has been performed across the world in more than forty countries. The play is based on the 1969 Piazza Fontana bombing and on the death of Giuseppe Pinelli while being interrogated by the police.