The Citadel was an old neighborhood of filthy alleyways that was established in the 1920s as a red-light district to house scores of prostitutes. In the 1930s and 1940s, the neighborhood became a thriving sex quarter with rampant crime. Female prostitutes walked the streets seminaked. One of the side streets became famous for its young male prostitutes. After the 1953 C.I.A.-led coup that reinstated the shah, the authorities walled off the area, turning it into a ghetto whose inhabitants were almost exclusively female prostitutes and their children; only men were allowed to access it through an iron gate.