- Lala Lajpat Rai was a key leader of the Indian National Congress, part of the 'Lal-Bal-Pal' extremist trio. - Vallabhbhai Patel was a senior leader of the Congress and played a crucial role in the freedom movement and post-independence integration. - S.C. Bose (Subhas Chandra Bose) was a significant leader within the Congress, serving as President twice, before forming the Forward Bloc after differences with Gandhi.