Mangal Singh passed his matriculation in 1911 and then joined the Khalsa College, Amritsar for further study.

After World War I broke out in 1914 he left the college and joined the military and posted at Mesopotamia.

After he returned to country, he vehemently opposed the policies of British Government, for this he was arrested many times.

He was the member of ad hoc committee who negotiated with Britishers which ultimately led to the passing of Sikh Gurdwaras Act, 1925.

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