(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.