Union subsidy - why deducting from union employee and what is the purpose?

Union subsidy why deducting from union employee. That deduction amount where to pay and what is the purpose? Please....

Hi Ranga,
Where are you employed? Does your union is recognised by your Co. under the Trade Union Act as a single bargaining representative on behalf of all employees having been elected thus.
Under this act, a nominal amount towards subscription/membership fee can be deducted from the salary of the members of the union and such recovered money will be paid to the recognised union by your Co.