Cash was known as the Man in Black because of the attire he wore. He was also a champion for prisoners, though only being incarcerated for minor misdemeanors such as going to the El Paso International Airport in October 1965 after U.S. Customs agents found hundreds of pep pills and tranquilizers in his luggage returning from Mexico. | Cash was known as the Man in Black because of the attire he wore. He was also a champion for prisoners, though only being incarcerated for minor misdemeanors such as going to the El Paso International Airport in October 1965 after U.S. Customs agents found hundreds of pep pills and tranquilizers in his luggage returning from Mexico. |