1940s–1950s
A weekday answer to a Saturday night rally.
Youth for Christ could fill Madison Square Garden. What it could not do, at first, was keep a teenager in Scripture on a Tuesday. YFC president Bob Cook called the weekend rally the show window and asked for something on the counters the rest of the week.
Kansas City supplied the counter. Hamilton's Bible Clubs borrowed the pace of College Bowl and the lockout buzzer of radio quiz shows, then pointed that energy at the New Testament. The model was portable. By the early 1950s it was the discipleship engine of a national youth movement.