The shift roster must be made available to the employees in writing at least one week before the start of the shift roster period.
After this, changes can be made to the shift roster by agreement with the employee in accordance with the employment contract, or for a justified reason. A justified reason is not, say, absence due to illness, another reason arising from employer obligation, or a strike. The employer must prepare for such situations in advance.
The employer is not allowed to exert pressure or impose sanctions on single employees for any union decision made by JHL. If such actions are taking place, contact your shop steward or regional office immediately.