They watch over the main character as he fights to repeal the Black Act in South Africa.  
The director of the Netherlands Opera asked its composer to write a "real" opera, and it debuted in Rotterdam in 1980.   Famous songs in it include The Kuru Field of Justice and Indian Opinion, and the main character is visited by spiritual guardians including Arjuna and Krishna in the opening, Tolstoy in Act I, Tagore in Act II, and Martin Luther King in Act III.  They watch over the main character as he fights to repeal the Black Act in South Africa.  FTP, name this Phillip Glass opera about Gandhi that takes its name from the Sanskrit word for nonviolence.
The director of the Netherlands Opera asked its composer to write a "real" opera, and it debuted in Rotterdam in 1980.   
Satyagraha