The boss is mistreating an employee and not giving him his due wages; is it permissible for the accountant to restore the employee’s right without the knowledge of the boss so as to redress the wrong that has been done?

No File Exists
Check below answers in case you are looking for other related questions:
Should he tell on an employee who goes to permissive websites?
Ruling on building tourist resorts and taking part in that

No File Exists
Related Answers:
Should he enter a program during which he will see women’s awrahs so that he can graduate quickly for his father’s sake?
She works in a store and some money was stolen from it, and she is afraid that she will be accused
Ruling on working for UberEATS (delivering food that may be halal or haram)
Should he tell on an employee who goes to permissive websites?
Ruling on building tourist resorts and taking part in that

Recommended answers for you:
The status of the imams of the Ithna ‘Ashari Shi’ah
The Evil Eye and Protection Against it
She did not eat suhoor and did not wake up for Fajr. Should she carry on fasting or break her fast?
Verses and hadeeth about hijab
Islam and slavery