Nikhil Gupta is accused of being involved in an unsuccessful plot to assassinate Gurpatwant Singh Pannun, a Khalistani separatist holding dual American and Canadian citizenship, in New York. Gupta's attorney, Jeffrey Chabrowe, described the case as a "complex matter" for both India and the US.
source https://timesofindia.indiatimes.com/nri/us-canada-news/indian-national-nikhil-gupta-pleads-not-guilty-in-sikh-separatist-assassination-plot/articleshow/111065649.cms