Who cannot form, join or assist labor organizations?

The following are workers who are not allowed to engage in the formation of, membership to or assistance to labor organizations: [1] Managerial employees
[2] Confidential employees
[3] Non-employees
[4] Member-employee of a cooperative
[5] Employees of international organizations
[6] High-level government employees
[7] Members of the AFP, police officers, policemen, firemen and jail guards