There are plenty of people now who think the cable companies are nothing but a cabal of greedy assholes. But you know who hated the cable companies more? Movie theaters and broadcast networks in the 1970s.
Boing Boing's Rob Beschizza writes that the Film and TV power players were paranoid about cable eating away at their profits, so they ran a campaign in movie theaters suggesting that "R-rated" shouldn't be allowed in homes. Obviously that paranoia was completely unfounded, as movie theaters are now bigger and as cash-hungry as ever, but you can't say they didn't know how to make an awesome piece of propaganda. [J-Walk via BoingBoing]