[8] He founded the organisation [1][2][3]Babbar Khalsa along with Talwinder Singh Parmar with the objective to secede from India and form the state of Khalistan for Sikhs.

[14] Babbar Khalsa claimed responsibly for killing the Nirankari head Gurbachan Singh on 24 April 1980.

This organisation has a presence in the United States, Canada, UK, Germany, France, Belgium, Norway, Switzerland and Pakistan.

[21][22][23] On 16 October 1981, Sukhdev and fellow Babbar Khalsa members attacked Niranjan Singh who was a Nirankari and Indian Administrative Service officer.

[30][31][32] On 22 May 1982, Babbar Khalsa members opened fire directed at Nirankari's in Patti killing 4 and injuring many more.

As Resham was talking about Bhindranwale, supposedly negatively, Babbars, Labh Singh and Sodhi pulled out stenguns and opened fire killing him instantly.

It is said that Babbars, Sodhi and Labh Singh fled on a Royal Enfield Bullet and fired victory shots.

[42] In February 1986 Babbar Khalsa members killed DSP (Deputy Superintendent of Police) Harpal Singh.

[43][44] On 19 January 1987, Babbar Khalsa members under Sukhdev killed Joginder Pal Pandey in Ludhiana.

Gobind Ram was killed in a bomb blast at the headquarters of the 75th battalion of the Punjab Armed Police in Jalandhar.

[50][51][52][53][54][55][56][57][58][excessive citations] On 16 February 1990, KCF, BTFK (Sangha), BKI, and SSF collectively claimed responsibility for an explosion in Phillaur that killed Inspector Harcharan Singh Soori and Assistant Sub-Inspector Ram Moorti on the 11th.

[61] On 26 February 1990, Babbar Khalsa attack a CRPF patrol near Ajab Vali killing 5 soldiers and injuring 6.

[61] On 2 March 1990, KCF, KLF, BKI, and SSF collectively claimed responsibility for killing 1 Sergeant and 1 Constable of Punjab Police in Nagoke for alleged “misdeeds”.

[62] On 2 March 1990, KCF, KLF, BKI, and SSF collectively claimed responsibility for a bomb attack in Philaur that killed 1 police constable and 2 others.

[63] On 16 March 1990, Babbar Khalsa members killed 3 serial rapists near Batala who were wanted in over 40 cases of rape.

[64] On 16 March 1990, Babbar Khalsa claimed responsibility for killing multiple BSF men in Zaffarwal.

[70][71][72] On 21 September 1990, KCF, KLF, BKI, and SSF claimed responsibility for an attack on a SPO base which killed 2 officers.

[73] On 21 September 1990, KCF, KLF, BKI, and SSF claimed responsibility for killing a Nirankari in Patiala.

[73] On 28 September 1990, KCF, KLF, BKI, and SSF claimed responsibility for killing Inspector Rajinderpal Singh.

[74] On 23 November 1990, KCF, KLF, BKI, BTFK, and SSF claimed responsibility for killing Congress president of Jalandhar district, Gurdarshan Singh.

Twenty-two days prior to his death Harjit had killed the chief of BTFK (S) Sukhwinder Singh Sangha along with four other militants.

KLF, KCF, Babbar Khalsa, SSF, and BTFK (S) members held a meeting afterward pledging to kill Harjit within 31 days of Sangha's death.

A famous kavishri ballad about this incident says, “24th November at exactly 9, for Sangha’s revenge Major Singh and his allies have arrived.

They claimed that the doctors had forged autopsy’s, improperly treated Sikhs, and aided in police killings.

[84] It is reported that India used the cat system (Special Forces personnel disguised as militant), to trap Babbar.

For helping neutralise the chief of the most powerful group of militants in the state, the turned member also received a full third of the reward on Singh.

[13][85] After his death, Punjab Police DGP Kanwar Pal Singh Gill accused Babbar of living a "king-like" lifestyle.

He further accused Babbar of living with Jawahar Kaur, a member of a popular singing group "Nabhe Wallian Bibian Da Jatha", and fathering an illegitimate child.

A major portion of his ancestral house of the Babbar Khalsa chief now stands demolished and the remaining dilapidated two-room set is locked.