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 give sufficient background information like 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 will it be given, why does he want to do that etc.
If sufficient information is not provided, then the replies may be guesses and the guesswork may not serve your purpose.
Thanks,
Dinesh Divekar