We are manufacturing Company in Chennai. Union was formed last year. we have around 88 employees. 75 of them have joined the UNIION.the employees have resorted to go slow for the past six months. they are producing only 60 to 65% of the daily output when compared with their own previous output.From start of this month we have started to stand near the machines to find what is happening. Today while this action of ours was in progress. the Union office beares walked to our HR head and asked what right does have to talk the employees.HR head replied to them he has every right and told them it is instead they who dont have any right to pose such questions to the management during working hours.Kindly suggest as to what action we can take against these erring workmen.