(a) discharging or punishing a workman, because he urged other workmen to join or organise a trade union,

(b) discharging or dismissing a workman for taking part in any strike (not being a strike which is deemed to be an illegal strike under this Act),

(c) changing seniority rating of workmen because of trade union activities,

(d) refusing to promote workmen to higher posts on account of their trade union activities,

(e) giving unmerited promotions to certain workmen with a view to creating discord amongst other workmen, or to undermine the strength of their trade union,

(f) discharging office-bearers or active members of the trade union on account of their trade union activities.