This depends on a few things, especially how the employees are paid (hourly, bonus, etc.), the size of the employer and number of employees affected, and their contract or terms of employment. If you believe that you are not being compensated fairly, contact a Maryland employment attorney.
No attorney-client relationship is intended to be created by this answer. Any advice given in this answer is intended to be general advice and not an opinion on any individual case, or the merits thereof. As a matter of policy, this attorney and his firm do not accept a new client without first investigating for possible conflicts of interests and obtaining a signed engagement letter.
The Maryland Wage Payment and Collection Law prohibits unauthorized deductions from wages. One of the main exceptions is where the employee authorizes the deduction in writing. Some employers have employees sign forms, authorizing certain deductions. However, in this situation, the deduction, even if it were authorized by the employees, cannot operate to bring the employees' wages to below minimum wage. The employees should contact an attorney if they believe that they were "shorted," especially if that brought their wages to below minimum wage.