 Women wrestlers and mud-filled rings also became common place.In the late 1930s, the London County Council banned professional wrestling, leaving the business in rough shape just before World War II.It was the promoters themselves who revolutionized the business during this time by using America's National Wrestling Alliance territory system under the guise of an alliance of promoters attempting to regulate the sport and uphold the committee's ideas to, in fact, create a promotional cartel designed to carve up control of the business between a handful of promoters - which it did in 1952 under the name of Joint Promotions.