After independence the Indian Civil Service was reorganised as a two-tier system. The central government controlled the All-India Services (AIS), namely, the Indian Administrative Service (lAS), the Indian Foreign Service (IFS) and the Indian Police Service (IPS) and the central services which were classified as Group A, B, C, and D services. The selections to the All India Services and Group A and B services are conducted by the Union Public Service Commission (UPSC).