While in college Lala Lajpat Rai joined the Arya Samaj founded by Swami Daya Nand Saraswati. Soon he became one of the three most prominent Hindu Nationalist members of the Indian National Congress, the Lal-Bal-Pal trio. They formed the extremist faction of the Indian National Congress, as opposed to the moderate one led first by Gopal Krishna Gokhale and then Gandhiji. Lalaji actively participated in the struggle against partition of Bengal. Along with Surendra Nath Banerjee, Bipin Chandra Pal and Aurorbindo Ghosh, he galvanized Bengal and the nation in a vigorous campaign of Swadeshi. Lalaji was arrested on May 3, 1907 for creating “turmoil” in Rawalpindi. He was put in Mandalay jail for six months.
He left for Britain in April 1914 to organize propaganda in foreign countries about freedom struggle. At this time First World War broke out and he was unable to return to India. He went to USA to galvanize support for India. He founded the Indian Home League Society of America and wrote a book called “Young India”. He was able to return to India in 1920 after the end of World War. After his return, Lala Lajpat Rai, led the Punjab protests against the Jalianwala Bagh Massacre and the Non-Cooperation Movement. He was arrested several times. He disagreed with Gandhiji’s suspension of Non-Cooperation movement due to the Chauri-Chaura incident, and formed the Congress Independence Party, which had a pro-Hindu slant.
In 1928, British Government decided to send Simon Commission to India to discuss constitutional reforms. The Commission had no Indian member. This greatly angered Indians. In 1929, when the Commisssion came to India there were protests all over India. Lala Lajpat Rai himself led one such procession against Simon Commission on October 30, 1928 in Lahore. While the procession was peaceful, James Scott, superintendent of Police brutally lathicharged the procession. Lala Lajpat Rai received severe head injuries and died on November17, 1928. Subsequently to avenge Lalaji’s death, Bhagat Singh and others planned to kill James Scott, however ended up killing John P. Saunders, Assistant Superintendent of Police, in case of a mistaken identity.