The Central Government has established a number of Police organisations known as the Central Police Organisations (CPOs). CPOs functioning under the Central Government can be broadly divided into two groups. One is the armed Police organisations, known as Central Armed Police Forces (CAPFs), The other group consists of organisations such as the Bureau of Police Research and Development (BPR&D), Central Bureau of Investigation (CBI), Directorate of Coordination of Police Wireless (DCPW), Intelligence Bureau (IB), National Crime Records Bureau (NCRB) and National Institute of Criminology and Forensic Science (NICFS). In addition, there are Police Training institutions, such as the National Police Academy (NPA) and the North Eastern Police Academy (NEPA). Some intelligence and investigating agencies under the Ministry of Finance also do policing work. They are involved in collecting intelligence and investigating economic offences pertaining to customs, excise, income tax, foreign exchange, money laundering and narcotics smuggling. Some of these are the Central Economic Intelligence Bureau, Directorate General of Revenue Intelligence, Directorate of Enforcement, Financial Intelligence Unit, Directorate General of Anti-Evasion, Directorate General of Income Tax (Investigation), Narcotics Control Bureau, etc. Similarly, there are some intelligence organisations, such as the National Technical Research Organisation (NTRO), Research and Analysis Wing (RAW), Aviation Research Centre of RAW, that function under the Cabinet Secretariat. Another organisation under the Cabinet Secretariat is Special Protection Group, which provides security to Prime Minister and his family members. There is a Railway Protection Force that functions under the control of the Ministry of Railways. The CPO’s are generally headed by Director or DGP rank officers.