In this book all the important provisions of the Unlawful Activities (Prevention) Act 1967 (UAPA) and the National Investigation Agency Act, 2008 (NIA) are analyzed and interpreted. The author has tried to maintain the basic feature of the book in presenting the subject in a clear, comprehensive and lucid manner, so that the readers case easily grip the subject. Care had been taken to see that the legislation be arranged in a methodical and a systematic way for the convenient reading and understanding of the subject bu the readers. The book has five chapter. The first Chapter of the book contains the general introduction of the Act. The second chapter deals with the salient features of the Act and the Amendments of the Act.