We shared the above graph last Labor Day — but it’s so important, we want to share it again.

Please spread this information far and wide, since this is data everyone should see on our annual celebration of the labor movement.

The above graph comes from the Economic Policy Institute. It shows the relationship between union density and the percentage of national income going to the richest 10 percent of Americans. As you can see, the larger the share of the American workforce that’s unionized, the lower the share of national income that goes to the superrich — and vice versa.