Last In, First Out Policy apply when terminating employees in the same role?

Does the "last in, first out" policy apply when terminating employees in the same role or same department?
If i need to terminate 3 employees due to reduced work, do i have to look at who came in last to that particular department & role, or the newest joinees to my firm?
Basically my question is - which of these are the law?
Last In to the role of Web Designer
Last In to the department - Web Design or
Last employee to be hired in the company

It is actually the Last employee hired in the Organisation / newest entry to your firm over all.

Thank you. If however a manager wanted to reduce his department strength, can he then follow a last in, first out solely for this team?

Think of job rotation for the Sr.workmen to another department and train him. If success then the matter is simple