COVID 19 - Facing severe cash crunch - whether the companies in India can ask their employees to go on unpaid leave for a month?

Sensiple
Hi, In the current scenario when most of the companies are facing severe cash crunch and almost nil business, whether the companies in India can ask their employees to go on unpaid leave for a month and once the situation gets back to normal the employees could join back and their salary gets computed from their date of reporting back to duty.
Is our Shops and Establishment act protects the employees being sent on long leave without salary.
Most of the India companies operate with the borrowings from Bank and in the current situation where no one can predict the future, companies will always intend to save what ever they could for using them once the situation come to normalcy.
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