[8] Mann was educated at the Bishop Cotton School, Shimla and Government College Chandigarh.

SP Ferozepur, SP Hoshiarpur, SSP Faridkot, AIG GRP Punjab-Patiala division, Deputy Director of Vigilance Bureau Chandigarh, Deputy Inspector General of Punjab Armed Police, and DIG (Group Commandant) of CISF, Bombay.

[1] Due to his 1984 Political involvements he won 1989 Lok sabha elections from Tarn Taran (Lok Sabha constituency) in absentia with their 6 other candidates on Shiromani Akali Dal (Amritsar) ticket and 3 other candidates also won backed by them.

[10] He was elected in absentia to the Lok Sabha representing the constituency of Tarn Taran by an overwhelming majority, and unconditionally released "in the interests of the State" in November 1989, with all charges dropped.

[11] In 1990, Mann insisted on bearing his Kirpan (small sword) into the Parliament session, a religious rite in the Sikh Faith.

[13] On 3 November 1999, after Mann was elected to the Lok Sabha by winning in the Sangrur Lok Sabha constituency, the Punjab and Haryana High Court ordered the Government of India and the Passport Office in Chandigarh to issue a passport to him.

[14] On 23 March 2004, Prakash Singh Badal accused Mann of running derogatory ads against him and indulging in character assassination.

Radical organization Dal Khalsa (International) had supported candidates of SAD (Amritsar).

[21] He asked for elections in the Shiromani Gurdwara Parbandhak Committee (SGPC), the apex religious body of Sikhs.

[22] He lost the Sangrur seat in 2024 General elections to Meet Hayer of Aam Aadmi Party.

[17] Under his leadership, his party SAD (A) continued its position of creating Khalistan as a buffer state between India and Pakistan.

He dedicated his 2022 Lok Sabha election victory to the Khalistan separatist leader Jarnail Singh Bhindranwale.

Mann had tweeted condemning the Punjab Police's operation against separatist leader Amritpal Singh and the arrest of his supporters.

A lawsuit was filed against him, but the prosecution failed to prove its case and he was acquitted by the civil court in 2013.