How does the battle over the taft-hartley act demonstrate the constitution's version of checks and balances?

The Taft-Hartley Act (also called the Labor Relations Management Act of 1947), which defends workers and their rights, and has avoided many strikes since its inception, has been reformed and amended many times throughout its time of life, has been the cause of legal battles, and even a veto of President Truman, which was annulled by the Senate: demonstrates how the Constitution and its Acts are reformed, laws are debated, and seeks to achieve adjustment and review of each law of the Constitution year by year, regardless of the strong political and legal struggle that this represents.