[4] Harmeet began associating himself with militants and became close with Khalistan Liberation Force chief Harminder Singh Nihang.

On 2 February 2008, Harmeet and other Khalistan Liberation Force members launched an attack on the head of Dera Sacha Sauda Ram Rahim.

3 men believed to be connected to Harmeet were arrested with 5 AK-56, 11 pistols, 900 cartridges, 2.5 million fake rupees and 25-kg heroin.

[13] The same day KLF assassinated Dera Sacha Sauda, Srisa Manager Lilly Kumar in Ludhiana.

[21][22][23] On 7 November 2014, Harminder Singh Nihang, KLF chief, was arrested at Indira Gandhi International Airport in Delhi.

[25] Harmeet next masterminded targeted killing of Dera Sacha Sauda, RSS, and Shiv Sena members and leaders.

[27][29] On 13 April 2015, KLF shot Shiv Sena Punjab secretary Harvinder Soni in the stomach at 8:30 am in Fish Park.

[30][31][32] In July 2015 Khalistan Liberation Force mailed letters to seven Shiv Sena leaders including Sanjeev Ghanauli, Rajeev Tandon, Rakesh Arora, Amit Arora, Rubal Sandhu, Sachin Ghanauli and Rajesh Palta that gave a last warning for them to leave Punjab.

[33] On 3 August 2015, president of the Punjab wing of Akhil Bharatiya Hindu Suraksha Samiti, Manish Sood, was killed.

[34] Akhil Bharatiya Hindu Suraksha Samiti, Bajrang Dal and Shiv Sena and certain BJP leaders and members made a call for bandh and shops to be closed in Sirhind to protest the killing.

[36][37][38] On 19 January 2016, Rashtriya Swayamsevak Sangh (RSS) leader Naresh Kumar shot at and injured by Shera and Bagga at Kidwai Nagar's Shaheedi Park in Ludhiana city.

[39][27] On 3 February 2016, Amit Arora, a Shiv Sena leader, was attacked by Shera and Bagga while he was sitting in his car in Ludhiana.

[41][42][43] On 6 August 2016, Rashtriya Swayamsevak Sangh (RSS) Punjab Vice-President and retired Brigadier, Jagdish Gagneja was shot at by Bagga and Shea in Chandigarh.

He was admitted to hospital and died on 22 Sep.[44][45][46][27] On 27 November 2016, the leader of KLF, Harminder Singh, escaped from maximum security Nabha jail with 5 accomplices.

[13] On 14 January 2017, Amit Sharma religious preacher, president of Hindu Takht and political activist of Indian National Congress killed in Ludhiana city by Bagga and Shera.

[54][55][27] On 17 October 2017, RSS and Bharatiya Janata Party leader Ravinder Gosai was shot dead in Ludhiana by Bagga and Shera.

[66][67][68] In the aftermath of the attack, at the request of the NIA, the Home Ministry banned KLF under the Unlawful Activities Prevention Act.