Is it obligatory to inform the supervisory authorities about the payment of bribes and the illicit purchase of classified information, or to conceal the perpetrators, knowing that advice has been futile and that officials are aware of it?

If the information conveyed by employees to the company leads to corruption or the loss of a benefit, then this is unlawful (haram). If they do so for a bribe, it is another sin, for the Prophet, peace and blessings be upon him, said: "The Messenger of Allah, peace and blessings be upon him, cursed the briber and the bribed." They must be admonished and threatened with reporting. If they do not desist, then reporting them becomes obligatory. This falls under the category of changing evil, for Allah Almighty says: "And let there be [arising] from you a nation inviting to [all that is] good, enjoining what is right and forbidding what is wrong, and those will be the successful," and for his saying, peace and blessings be upon him: "Whoever among you sees an evil, let him change it with his hand; if he cannot, then with his tongue; if he cannot, then with his heart—and that is the weakest of faith." There is no contradiction here with "From the excellence of a person's Islam is his leaving alone what does not concern him," as this refers to leaving alone the private affairs of others that do not concern him, and not to abandoning enjoining good and forbidding evil.