Amitabh Bachchan is hardly a household name in the U.S., but in his native India, he is a megastar. He has appeared in more than 150 Bollywood films and served as a longtime host of the country's wildly popular version of "Who Wants to Be a Millionaire?"
So when Bachchan made a foray into Hollywood with a small role in the 2013 film "The Great Gatsby," it was big news in his home country.
For a small group of U.S. Sikhs, it was also an opportunity.
The group, Sikhs for Justice, has filed a lawsuit in the U.S. making the improbable argument that Bachchan's work with a U.S. film company gives American courts the ability to hold him responsible for the...