Workplace Democracy Act This bill amends the National Labor Relations Act and related labor laws to preserve workers' rights to join labor organizations and engage in collective bargaining. Specifically, it prohibits employers from classifying employees as independent contractors or supervisors to avoid employee participation in union activities; allows the National Labor Relation Board to certify a union, without a secret election, if it receives the consent of the majority of eligible workers; requires employers to begin negotiating with a new union within 10 days of its certification; prohibits coercion of employees to to participate in campaign activities unrelated to their job duties; requires employers to make disclosures of anti-labor organization activities; and repeals provisions allowing states to prevent labor organizations from collecting dues from nonunion workers who benefit from union representation (right to work laws).