In the united states, shortwave listening is an obscure hobby, and listening for pirates is even more obscure. I have heard a rumor that in the late 1940s, some congressmen pressured radio receiver manufacturers to stop including shortwave in their consumer receivers, and to include instead FM. FM, of course, is higher quality, but can only be received within 50 or 60 miles at most, whereas shortwave can be heard around the world. I have heard that the congressmen stepped in because they did not want americans listening to radio moscow, or news from any source outside the US for that matter.
I'm looking for verification of this story.