There are four basic categories of employer misconduct which the Industrial Peace Act (hereinafter referred to as the "act") labels as unfair labor practices. The first is a very broad category; it includes interference, restraint or coercion of employees with respect to their right to organize. The other three refer to particular types of conduct: (1) requiring "yellow dog" contracts; (2) company unionism; (3) discriminatory practices affecting employment which encourage or discourage membership in any labor organization,"' or prejudicial acts committed against an employee for having filed charges, testified, or for being about to testify under the act.
Philippine Labor Law—A Survey [Part 2],
40 Wash. L. Rev.
Available at: https://digitalcommons.law.uw.edu/wlr/vol40/iss4/5