Is it permissible for employees to take a portion of the company's money without the manager's knowledge as compensation for his non-compliance with the contract, knowing that the contract prohibits filing a lawsuit in Egypt?

Allah has commanded the fulfillment of contracts and has warned that He will be an adversary on the Day of Judgment to whoever does not give the laborer his due. Your situation with this man is one of two possibilities:

1. If he promised you a certain salary then changed it when the contract was signed, and you agreed under duress, he is not legally bound by the previous promise, but he is religiously bound, because breaking a promise is a sign of hypocrisy. 2. If the contract was signed for the agreed-upon amount beforehand, and then he reneged, you have the right to take your due from the work if you cannot obtain it through legitimate means, as long as no harm results to you from doing so. Otherwise, seek your reward from Allah.