Quote Originally Posted by Matt View Post
The Sun Makers, for example, was about as blatant as you could be short of Tom Baker narrating the actual message while the episode played in the background.
The Green Death had the Doctor literally saying words to the effect of "look after your damn planet"

There are so many examples of it in classic Who.
Yeah take Robert Holmes one of the greatest Dr. Who writers of all time but back in the day if something in society was bothering him you be sure to hear about on Who and he wasn't subtle like the Two Doctors and eating meat.