The Multi-Disciplinary Monitoring Agency (MDMA), a unit of the Central Bureau of Investigation (CBI) probing the 1991 assassination of former prime minister Rajiv Gandhi, seldom makes headlines. Formed in December 1998 to unearth the larger conspiracy behind the suicide bombing, the agency has been around for the past two decades—working stealthily, away from the public eye. It was, however, in the news again during the bitter CBI reshuffle this month when the bureau’s No. 4, joint director (policy) Arun Kumar Sharma, was shunted there.