On a complaint under section 146 it shall be for the employer to show what was the sole or main purpose for which he acted or failed to act
In determining any question whether the employer acted or failed to act, or the purpose for which he did so, no account shall be taken of any pressure which was exercised on him by calling, organising, procuring or financing a strike or other industrial action, or by threatening to do so; and that question shall be determined as if no such pressure had been exercised.
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