The 1Malaysia Development Berhad scandal, often referred to as the 1MDB scandal or just 1MDB, describes a corruption, bribery and money laundering conspiracy in which the Malaysian sovereign wealth fund 1Malaysia Development Berhad (1MDB) was systematically embezzled, with assets diverted globally by the perpetrators of the scheme. It had a global scope, implicated institutions and individuals in politics, banking, and entertainment, and sparked criminal investigations across a number of nations. The 1MDB scandal has been described as "one of the world's greatest financial scandals" and declared by the United States Department of Justice as the "largest kleptocracy case to date" in 2016.
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Originally 1MDB stands for of 1Malaysia Development Berhad was a Malaysian state fund, set up in 2009 to promote development through foreign investment and partnerships. The then prime minister, Najib Razak, was its chairman.

The fund has since been at the heart of one of the biggest corruption scandals in the world. The US justice department believes more than $4.5bn was stolen by Jho Low and the resulting scandal has been responsible for the toppling of a government this year and the arrest of Najib, his wife, Rosmah Mansor, and a growing number of close associates.