Final answer:
The correct answer is option C. Taft-Hartley continues to impact unions by restricting their ability to organize and engage in certain activities.
Step-by-step explanation:
The Taft-Hartley Act has ongoing consequences that continue to impact unions today. Passed by Congress over President Truman's veto in 1947, the Taft-Hartley Act restricted many powers of unions, including the elimination of closed shops and the imposition of notices before strikes. This legislation led to the decline of smaller unions, hampered the organization of new unions in service and technology fields, and contributed to the failure of unionization efforts in the American South.
The Act's provisions that allow states to pass "right-to-work" laws have been particularly significant, as they limit the organizational methods used by unions and give workers the ability to decline union membership, making it less encouraging for those seeking to unionize. The legal climate has become less friendly to unions compared to the period following the National Labor Relations Act of 1935, leading to a decline in union membership levels.