I’ve heard this saying many times, but really didn’t know much about the history of it. Turns out it was coined by Fr. Peyton, sometime in the late 40s or early 50s. At one point, he led a rosary rally in San Francisco that reportedly drew over half a million people.
In honor of the 50th anniversary of this historic event, a Family Rosary Crusade has been organized for October 15th, again in San Francisco. More info here.
Hope you can attend or support something similar in your hometown.