What was the principal effect of the National Labor Relations Act?

A) Strengthening the position of employers in resisting union organizing efforts
B) Severely restricting union flexibility in organizing
C) Making it illegal for an employer to refuse to negotiate with a union
D) Giving unions virtually unlimited power in organizing and negotiating

The National Labor Relations Act, also known as the Wagner Act, was enacted in 1935 to protect the rights of employees and employers, to encourage collective bargaining, and to curtail certain private sector labor and management practices, which can harm the general welfare of workers, businesses, and the U.S. economy. A principal effect of the Act was making it illegal for employers to refuse to negotiate with unions that represent their workers, thereby strengthening the position of unions and promoting collective bargaining.