liberator:
(plural: ‘liberators‘; pronunciation: the letter ‘i’ rhymes with the letter ‘i’ in “ink”)

Moses, the liberator of Jews
a person who is believed to or who sets another person free from political and religious control or the injustice somebody else forces on that person — from a prison, or even from anxiety, worry, duty, etc. (= a person who fights for ‘liberty’ which means ‘freedom’);
a rescuer,

liberators/rescuers of hijack hostages
‘Liberator’ is a very formal word and used mostly in political literature and religious scriptures, for example, “According to the Bible, Mosses was the liberator of Jews from slavery.”
When it comes to one’s own mental confinement, the person himself is his own liberator.
The modern day liberators are the politicians or soldiers who liberate people from the dictators of some countries who oppress their people and subject them to near slavery.
