Mahatma : Life of Gandhi. The Power & Wisdom of non-violent resistance. (Ahimsa = Non-Violence);

Satyagraha, which can be loosely translated as "insistence on truth," is a philosophy of non-violent resistance that was originated by Mahatma Gandhi and which heavily influenced many civil rights movements of the 20th century. 

Source : https://www.bol.com/nl/p/non-violent-resistance/9200000028077968/

Gandhi's life as Lawyer revealed.

https://www.wvpublic.org/post/gandhis-life-lawyer-revealed#stream/0

mahatma [ muh-haht-muh, -hat- ] noun (sometimes initial capital letter) a Brahman sage. (especially in India) a person who is held in the highest esteem for wisdom and saintliness. (in Theosophy) a great sage who has renounced further spiritual development in order to aid those who are less advanced. 
 Source : https://www.dictionary.com/browse/mahatma