A reference in this Part to a person involved in a contravention of this Act means a reference to a person who—
(a) has aided, abetted, counselled or procured the contravention;
(b) has induced, whether by threats or promises or otherwise, the contravention;
(c) has been in any way, directly or indirectly, knowingly concerned in or party to, the contravention;
(d) has conspired with others to effect the contravention.