I heard it was about unregulated AM stations in the 30's. Since they could be heard in other countries and didn't have the same trade and FCC regulations we do they were used to hawk a lot of stuff you couldn't on normal radio; homemade pharmaceuticals, unapproved cures, political ideology, etc.... Apparently they would come through crystal clear since there wasn't much or any wattage limitation.
I heard it was about unregulated AM stations in the 30's. Since they could be heard in other countries and didn't have the same trade and FCC regulations we do they were used to hawk a lot of stuff you couldn't on normal radio; homemade pharmaceuticals, unapproved cures, political ideology, etc.... Apparently they would come through crystal clear since there wasn't much or any wattage limitation.