7. Prohibition on workmen and their trade unions in respect of certain acts.

No workman or trade union of workmen and no person acting on behalf of such trade union shall -

(a) except with the consent of the employer, persuade at the employer's place of business during working hours a workman of the employer to join or refrain from joining a trade union: Provided that the provisions of this paragraph shall not be deemed to apply to any act by a workman employed in the same undertaking where the act does not interfere with him normal duties;

(b) intimidate any person to become or refrain from becoming or to continue to be or to cease to be a member or officer of a trade union; or

(c ) induce any person to refrain from becoming or cease to be a member or officer of a trade union by conferring or offering to confer on any person or by procuring or offering to procure any advantage.