A person who advocates for the emancipation of others, particularly in terms of social or political freedom.

स्वतंत्रता का पक्षधर

English Usage: The emancipationist campaigned tirelessly for the rights of the oppressed.

Hindi Usage: स्वतंत्रता का पक्षधर दबे-कुचले लोगों के अधिकारों के लिए tirelessly संघर्ष करता रहा।