Section 4 Trade unions, and employers' and trade organisations.
It shall be unlawful for an organisation to which this section applies or any person concerned with the affairs of such an organisation—
to discriminate against a person who is not a member of the organisation by refusing or deliberately omitting to admit him to membership of the organisation on the like terms as other persons applying for membership;
to discriminate against a member of the organisation by refusing or deliberately omitting to accord him the same benefits as are accorded to other members thereof, or to take the like action on his behalf as is taken on behalf of other members, or by expelling him from the organisation.
This section applies to organisations of employers or workers or other organisations concerned with the carrying on of trades, businesses, professions or occupations.