Cyberattacks on dozens of American companies have been traced to an area on the outskirts of Shanghai that houses a Chinese military unit, according to a report out Tuesday by Mandiant, a U.S. cybersecurity company.

The 60-page document, first reported by The New York Times, says the group behind the attacks — nicknamed "Comment Crew" — is the most prolific the company has ever tracked and has been hacking U.S. companies since at least 2006.

Mandiant says the hackers' real identity is Unit 61398 of China's People's Liberation Army, or PLA.

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This is MORNING EDITION from NPR News. I'm Renee Montagne.

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And I'm Linda Wertheimer.

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NPR's business news starts with begins with a corruption case in India.

India has dispatched investigators to Italy to examine allegations of kickbacks, kickbacks involving a $700 million defense deal. The case involves the sale of a dozen helicopters to India from one of Italy's largest industrial groups.

From New Delhi, NPR's Julie McCarthy has more on a case that's rattling the Indian government.

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Hey, Mississippi can righteously proud of the part it played as the cradle of America's quintessential music, the blues. American music by way of Africa. One place in particular, Mali, has long laid claim to giving birth to the blues.

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MONTAGNE: Here the legendary Ali Farka Toure.

Mali's musical tradition was threatened this past year when Islamist militants took over the vast deserts of Northern Mali and immediately banned music - an incredibly painful experience for Malians.

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OK. Let's stay with tablets, the digital kind. The kind we used to download apps. Our last word in business today is: apps aplenty.

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With the popularity of tablets and smartphones, people have been downloading about 10 apps per month onto their devices.

MONTAGNE: Great news for businesses, perhaps, except research from the business consulting firm Nuance Enterprise shows that the vast majority of those apps are quickly abandoned, especially those that are free.

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Now, a look at one part of the immigration debate in Congress: a proposed increase in H1-B visas. Those are the visas that allow companies to hire skilled foreign workers. As NPR's Martin Kaste reports in today's "Business Bottom Line," offering more of those visas is controversial, especially among American tech workers of a certain age.

MARTIN KASTE, BYLINE: Here in Seattle, people still have fond memories of the 1990s tech boom.

UNIDENTIFIED WOMAN: Do you want a cup of coffee?

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One of the country's most famous magazines - the 91-year-old Reader's Digest - is filing for bankruptcy for the second time in less than four years. The digest originally offered just what the title promises - short versions of stories that had appeared in other publications. Now, it's filled with perky consumer news you can use, as well as a long-running advice columns, puzzles and jokes. Reader's Digest claims it still has 26 million readers worldwide, but the magazine's revenue took a big hit last year from falling sales overseas.

This year marks the 50th anniversary of Gideon v. Wainwright, the Supreme Court's landmark decision requiring the states to provide lawyers for poor people accused of committing crimes. Clarence Gideon, the defendant in that case, wrote his own petition to the high court in longhand, and Tuesday, the Supreme Court is hearing the case of another defendant who, in the longest of long shots, filed a handwritten petition from prison asking the justices for their help.