Coal scam: (2012)

Between 2004 and 2009, the UPA (United Progressive Alliance) government, led by Prime Minister Manmohan Singh, allocated coal blocks to various companies.
The intent was to improve domestic coal production and support power generation and steel industries.
However, the allocations were made without a competitive bidding process, which raised suspicions of favoritism and corruption.
In 2012, the Comptroller and Auditor General of India (CAG) released a report estimating that the nation lost about ₹1.86 lakh crore due to these arbitrary coal block allocations.