Section 50

the payment of salaries, allowances and expenses to officers and employees of the trade union;

the payment of costs and expenses of the administration of the trade union including audit of the account of the funds of the trade union;

the prosecution or defence of any legal proceeding to which the trade union or any member thereof is a party, when such prosecution or defence is undertaken for the purpose of securing or protecting any right of the trade union as such or any right arising out of the relations of any member with his employer, or with a person whom the member employs;

the expenses incurred in the settlement of disputes under