New Delhi, March 15 -- Opposition parties hit the streets in the Capital on Wednesday and 16 of them wrote a formal complaint to the Enforcement Directorate alleging that the Adani Group engaged in corporate fraud, political corruption, stock price manipulation and misuse of public resources, marking their strongest action yet in an ongoing political saga involving the embattled conglomerate.

The four-page letter addressed to ED director SK Mishra was written on the letterhead of Congress chief Mallikarjun Kharge, and signed by members of 15 other parties.It flagged five separate issues and asked the federal agency to take "immediate action" on the allegations.

"Over the last three months, several crucial pieces of evidence have been ma...