Conversation so far:
How did Lala Lajpat Rai die?
James A. Scott ordered police to baton charge protesters and personally assaulted Rai. Rai did not fully recover from his injuries and died of a heart attack
When did Lala Lajpat Rai die?
Lala Lajpat Rai died on 17 November 1928.
What was Lala Lajpat Rai's relationship to Bhagat Singh?
Bhagat Singh vowed to take revenge as it was a murder of a very tall leader in the freedom movement,
What is the HRA/HSRA in relation to Bhagat Singh?
Hindustan Socialist Republican Association was a revolutionary organization, also known as the Hindustan Socialist Republican Army, established in 1928 by Bhagat Singh among others.

Question: Who is Saunders?
Self-contained rewrite: Who is John Saunders in relation to Bhagat Singh?