To put my cards on the table, I am a Marxist. I also agree with every part of your comment. This is why (disciplined) Marxists oppose the NLRB and other aspects of Americanized union arrangements, and it's why we support right-to-work. The NLRB and the slew of anti-labor laws enacted in the US in the late forties have effectively weakened unions to the point that they cannot fight for anything without navigating the NLRB's bureaucratic maze of anti-labor regulations. Realize these laws were enacted in direct response to soldiers returning from WW2 and not taking shit from anybody. They made demands, fought for them, and won, and capital passed these laws in response.
So...the question now becomes: How do you feel about illegal wildcat strikes? Would you support abolishment of the NLRB? Would you support reversal of the Taft Hartley act? Which side are you actually on?