Karti ‘misused his influence’ in the home ministry in 2011 and ‘conspired’ with co-accused to devise a “back-door way to defeat the purpose of ceiling” on work permits imposed by the ministry, CBI has alleged. Karti’s father and senior Congress leader P Chidambaram was home minister in 2011. P Chidambaram has not been named as an accused in the FIR.