What is the turning point in Gandhi's life from the biography, Gandhi?

The turning point in Gandhi's life occurs in South Africa, where non-whites are not allowed to travel first-class, when a railroad official refuses to honor his ticket. Once Gandhi experiences the third-class status of Indians in South Africa, he dedicates himself to working for equality. Here, Gandhi serves his first jail term in an effort to achieve racial equality and organizes others to protest, developing his doctrine of satyagraha or "soul force," nonviolent resistance to achieve political and social equality.