The purposes of an unincorporated employers' association and, so far as they relate to the regulation of relations between employers and workers or trade unions, the purposes of an employers' association which is a body corporate are not, by reason only that they are in restraint of trade, unlawful so as—
to make any member of the association liable to criminal proceedings for conspiracy or otherwise, or
to make any agreement or trust void or voidable.
No rule of an unincorporated employers' association or, so far as it relates to the regulation of relations between employers and workers or trade unions, of an employers' association which is a body corporate, is unlawful or unenforceable by reason only that it is in restraint of trade.