What is shown above should be obvious, but what is more important is what is not shown. As the number of labor union jobs go down, the more income and wealth are redistributed to the top. In the graph, this would be represented by a line rising from right to left as union membership declines. There’s a reason for this correlation.
Many union jobs are shipped overseas, and the difference between the old wages in the US and the new lower wages overseas are placed squarely into the pockets of the affluent via higher corporate earnings, rising share prices and surging dividends.