What was the crime for which Gerald Gault was arrested?

Answer: Gerald Gault, a 15-year-old boy, was arrested by the Sheriff of Gila County in Arizona for making obscene phone calls to a neighbor.

Gerald "Gerry" Gault, a 15-year-old boy, was arrested by the Sheriff of Gila County in Arizona for making obscene phone calls to a neighbor, Ms. Cook, on June 6, 1964.

Explanation:

On June 8, 1964, the sheriff of Gila County, Arizona, took 15-year-old Gerald Gault into custody, without notifying Gault's parents after a neighbor, Cook, complained of receiving an inappropriate and offensive telephone call. After returning home from work that evening to find her son missing, Gault's mother eventually located him at the county jail, but was not permitted to take him home