"The aristocratic and dictatorial attitude and non-performance of Amarinder Singh was responsible for the party's debacle in two successive Assembly elections in the state in 2007 and 2012," he alleged in a letter to AICC General Secretary Rahul Gandhi.
Mann alleged the Amarinder had alienated Scheduled caste, the traditional vote bank of Congress, from the party.
A three-time MLA from Phagwara, Mann alleged that Amarinder had shunned 'Balmiks' and 'Mazhabi' Sikhs who constituted over 50 per cent of the SC population in state.