I don't really get this line of thinking, it just seems like a denial of globalization, automation, and economics. Instead of helping the workers it more seeks to punish American capitalists--including all the people like me who hope to retire in the future with investments that grow. When the rest of the world is developed enough that a union could span the entire globe, then this would at least be logical again.
As an electrical engineer working for the company, two of my assigned jobs were 1) evaluating the cost effectiveness of replacing all the forklift drivers with robots and 2) installing new equipment to eliminate repetitive lifting roles on the packaging lines. I was actually surprised how much cheaper the human forklift drivers were than the robots (mostly this was because we had really efficient, hardworking drivers and the robots needed special accommodations and could not handle all special cases).
I left the company because it was very demoralizing working alongside people who you were being paid to replace. But make no mistake, the autonomous forklifts would have been cheaper if the company had to employ the drivers directly, taking the hit to their safety record and bottom line.
There are other ideas for increasing the bargaining position of American labor and reducing capital inequality. For example, plugging up the mechanisms by which trade deficit capital returns to the United States (through economics--not by law, so by increasing property taxes in cities with big foreign investment, reducing the federal debt, switching to regional taxation system, etc.). Another example, if economics, as a collective school of thought, could reconsider its obsession with monetary inflation and consider if technology driven deflation is actually a bad thing. A worker getting a deflationary pay raise would be in a much stronger bargaining position and would actually be claiming some of the rewards of all the technological advances of capitalism by default.