Philippine Educational Laws
Section 28. Discrimination Against Teachers Prohibited. - The rights established in the immediately preceding Section shall be exercised without any interference or coercion. It shall be unlawful for any person in commit any acts of discrimination against teachers which are calculated to (a) make the employment of a teacher subject to the condition that he shall not join an organization or shall relinquish membership in an organization (b) to cause the dismissal of or otherwise prejudice a teacher by reason of his membership in an organization or because of participation in organization activities outside school hours, or with the consent of the proper school authorities, within school hours, and (c) to prevent him from carrying out the duties laid upon him by his position in the organization, or to penalize him for an action undertaken in that capacity.