Is the company entitled to deduct profits generated from private work performed after official working hours, and to what extent is this work legitimate, and is the company entitled to confiscate workers' wages if there is a clause in the contract prohibiting work outside official working hours?

The fundamental principle is that a specific hired worker's services are owned only during official working hours. Outside of these hours, his employer has no authority over him, and he is free to work as he pleases. Even if his employer stipulates that he must not work for anyone else, even outside working hours, this does not permit the employer to infringe upon what he has earned outside his working hours. Rather, it is his money and his earnings, and he is permitted to benefit from it. The most the company can do if the employee violates the condition is to terminate the contract with him.