Here's the allegory, which he told for audiences from the 1940s to the 1960s. We need to begin sharing it too:
Mouseland was a place where all the little mice lived and played, were born and died. And they lived much the same as you and I do.You can hear hear Tommy Douglas himself tell the story from this 1961 clip at the CBC Archives. It's a story that needs to be told again, and again, and again. In 1944, 1961, 1982, 2000 and today. Because, sadly enough, most mice go through an astonishing transformation when they get rich and powerful. They become cats.
They even had a Parliament. And every four years they had an election. Used to walk to the polls and cast their ballots. Some of them even got a ride to the polls. And got a ride for the next four years afterwards too. Just like you and me. And every time on election day all the little mice used to go to the ballot box and they used to elect a government. A government made up of big, fat, black cats.
Now if you think it strange that mice should elect a government made up of cats, you just look at the history of Canada for last 90 years and maybe you'll see that they weren't any stupider than we are.
Now I'm not saying anything against the cats. They were nice fellows. They conducted their government with dignity. They passed good laws--that is, laws that were good for cats. But the laws that were good for cats weren't very good for mice. One of the laws said that mouse holes had to be big enough so a cat could get his paw in. Another law said that mice could only travel at certain speeds--so that a cat could get his breakfast without too much effort.
All the laws were good laws. For cats. But, oh, they were hard on the mice. And life was getting harder and harder. And when the mice couldn't put up with it any more, they decided something had to be done about it. So they went en masse to the polls. They voted the black cats out. They put in the white cats.
Now the white cats had put up a terrific campaign. They said: "All that Mouseland needs is more vision." They said:"The trouble with Mouseland is those round mouse holes we got. If you put us in we'll establish square mouse holes." And they did. And the square mouseholes were twice as big as the round mouse holes, and now the cat could get both his paws in. And life was tougher than ever. And when they couldn't take that anymore, they voted the white cats out and put the black ones in again. Then they went back to the white cats. Then to the black cats. They even tried half black cats and half white cats. And they called that coalition. They even got one government made up of cats with spots on them: they were cats that tried to make a noise like a mouse but ate like a cat.
You see, my friends, the trouble wasn't with the color of the cat. The trouble was that they were cats. And because they were cats, they naturally looked after cats instead of mice.
Presently there came along one little mouse who had an idea. My friends, watch out for the little fellow with an idea. And he said to the other mice, "Look fellows, why do we keep on electing a government made up of cats? Why don't we elect a government made up of mice?" "Oh," they said, "he's a Bolshevik. Lock him up!"
So they put him in jail.
But I want to remind you: that you can lock up a mouse or a man but you can't lock up an idea.