In March 2007, Hasan Ali's properties were raided by India's Enforcement Directorate and Income Tax officials based on allegations of hawala transactions. Hasan Ali's lawyer denied all the allegations and said he had no Swiss bank accounts and some of his rivals could be behind the charges. The Supreme Court of India intervened and asked why Khan and others were not interrogated despite sufficient evidence against them. After this criticism, Khan was arrested by ED in March 2011. In May 2011, ED formally chargesheeted Khan and his associate Kashinath Tapuriah under the Prevention of Money Laundering Act, 2002. ED lawyers said Khan had laundered money for international arms dealerAdnan Khashoggi on several occasions. Khan claimed that he was framed. Khan was charged with serving as a front for Khashoggi. Allegedly, in 2003, Khan helped launder US$300 million of money Khashoggi made through arms sales through the Zurich branch of Swiss bank UBS. Khashoggi reportedly had to use Khan as a front as UBS had blackballed him due to his notoriety. Introduced to UBS by Khashoggi in 1982, Khan enabled the arms dealer to launder funds held in American accounts through UBS Geneva. One of Khan's accounts eventually was blocked when it was determined that the source of the funds came from Khashnoggi's arms sales. India Today magazine claimed that it had verified a letter confirming that $8 billion in black money was in a Swiss bank UBS account and the Government of India too has verified this with UBS. However, the Swiss bank UBS denied Indian media reports alleging that it maintained a business relationship with or had any assets or accounts for Hasan Ali Khan accused in the $8 billion black money case. Upon formal request by Indian and Swiss government authorities, the bank announced that the documentation supposedly corroborating such allegations were forged and numerous media reports claiming $8 billion in stashed black money were false. India Today, in a later article, wrote, "Hasan Ali Khan stands accused of massive tax evasion and stashing money in secret bank accounts abroad. But the problem is that the law enforcement agencies have precious little evidence to back their claims. For one, UBS Zurich has already denied having any dealings with Khan." Indian government has asked the Indian mission in Berne to get in touch with banking authorities of Switzerland for obtaining details about Hasan Ali Khan's Swiss bank accounts. Hasan Ali named Praful Patel during hawala interrogation. His business partner Tapuriah revealed that Khan had intimate relationships with Congress leader Renuka Chowdhury. Khan even gifted her a diamond worth 1.2 cr. He was also friends with Congress leader Jagdish Tytler, ex-Samajwadi Party leader & actress Jaya Prada, former Chief Minister of Andhra Pradesh & Congress leader, Vijay Bhaskar Reddy, & film financier Yusuf Lakdawala.
