S. 567 would amend several provisions of the National Labor Relations Act (NLRA), which establishes the rights of most private-sector employees to engage in collective bargaining. The bill would change the statutory definitions of joint employer, employee, and supervisor; modify the list of actions that would qualify as unfair labor practices; and allow collective bargaining agreements to require all employees in a unit to contribute fees to a labor organization as a condition of employment. Employers would be required to post notices that inform workers of their rights under the NLRA and would be prohibited from engaging in certain labor practices. Parties negotiating an initial collective bargaining agreement would be encouraged to use the mediation and arbitration services of the Federal Mediation and Conciliation Service (FMCS) early in the collective bargaining process.