Hi All,
This discussion is getting so interesting.
With due respecte to @ O. Abdul Hameed, @Raj Kumar and @Sh Srinivas and other members, I wish to add that such cases of deduction from employee salary as "Check off Facility" works well when the large employee strength,where Union find it pratically difficult to collect the funds from their memebers. As rightly pointed out, consent in writing is a must from memebers and has its own additional HR process for company to maintain such documents.
Pratical problem arise when there is a dispute by the worker with union or a new Union is formed and other issues which may arise later; if management agrees to deduct such payment on behalf of Union, I am sorry to say but , it's like asking trouble for self by gaining nothing. So, always its safe legal counsillor advice to manangement is "AVOID". Provided, the company has a employees strength like that of National Insurance company or Indian Railways etc, who are spread across the country, such things works as its got its own dynamics and benefits to employees as well.
Ukmitra