Coming of age in the 1960s, John Wojtowicz took pride in being a pervert. His libido was excessive even by the libertine standards of the era, with multiple wives and lovers, both women and men.
In August, 1972, he attempted to rob a Brooklyn bank to finance his lover's sex-reassignment surgery. The attempted heist resulted in a fourteen-hour hostage situation that was broadcast on TV. Three years later, Pacino portrayed his character instigating the unforgettable crime on the big screen. The award-winning film had a profound influence on Wojtowicz, when he emerged from prison six years later, he became known as "The Dog."