This clip dates back to 1986 and this was the time frame when Al Gore's & his wife Tipper were making a name for thenselves complaining about lyrics in rock albums. This is the time when warning labels on records came about. Frank volunteered himself to be the point man against warning labels. At 19 mionutes, it's long, but Frank is pretty entertaining in it.
YouTube - Frank Zappa on Crossfire
If you've got some extra time, check out Frank testifying before Congress. You can see a young Al Gore talk a lot, but not say a damned thing.....but he knows what's best for you!
YouTube - Frank Zappa - PMRC Senate Hearing 1of4