Your right to join a union is protected by law
Every employee is free to be a member of a trade union and to participate in its lawful activities. There is a prohibition against dismissal.
No person shall:
(a) refuse to employ or refuse to continue to employ a person
(b) threaten dismissal of or otherwise threaten a person
(c) discriminate against or threaten to discriminate against a person with respect to employment or a term or condition of employment or membership in a trade union, or
(d) intimidate or coerce or impose a pecuniary or other penalty on a person because of a belief that the person may testify in a proceeding under this Code or because the person has made or is about to make a disclosure that may be required of the person in a proceeding under this Code or because the person has made an application, filed a complaint or otherwise exercised a right conferred by or under this Code or because the person has participated or is about to participate in a proceeding under this Code.
-Part 2, Section 4(1), 5(1) of the B.C.Labour Relations Code