Dear JS Patyal,
We, the members of this forum, are outsiders. We do not know what happened in your company. Therefore, while raising a query, members of this forum expect the querist to provide sufficient background information. This includes why the employees were protesting, where they were protesting, how the media came to know about the protest, etc. Furthermore, who wants to give evidence, to whom it will be given, why they want to do so, etc.
If sufficient information is not provided, the replies may be guesses, and the guesswork may not serve your purpose.
Thanks,
Dinesh Divekar