The Congress party has expelled 12 rebels contesting polls including seven former legislators from the party for six years on Friday.
A Congress spokesperson said the party has expelled 12 rebels candidates contesting polls against the official candidates on the ground of anti-party activities.
Congress leaders said the decision to expel rebels is a warning for others who will defy party discipline.
Congress is contesting 51 of 243 assembly constituencies in Bihar assembly polls in alliance with Rashtriya Janata Dal,175, Nationalist Congress Party, 8 and Communist Party of India-Marxist, 9 seats.
Congress president Sonia Gandhi is schedule to jointly campaign with RJD chief and Railway Minister Lalu Prasad Yadav and NCP president Sharad Pawar on Saturday in Patna.