Are the year-end bonuses for workers in the sewing factory, which the authorities have approved as labor law, considered halal or haram?

The default rule is that it is not permissible to legislate a law that specifies workers' wages or obliges employers to pay them additional dues, unless there is a general need for it. For example, if factory owners exploit the workers' needs under certain circumstances, then the ruler may legislate such a law to the extent that it achieves public interest and removes injustice. This falls under the category of obligatory price fixing (tas'ir wājib) that some scholars have advocated. So, if the public interest depends on setting prices for the wages of certain industries, the ruler may impose that at the equivalent wage (ajrat al-mithl). However, if there is no general need, then it is not permissible.