(Bloomberg) -- Deerfield Management, a $7 billion firm that invests in health care companies, has received a subpoena from U.S. authorities over its relationship with the founder of a Washington political-intelligence company, according to a person with direct knowledge of the matter.

Deerfield told investors in an Oct. 27 letter that the government's request relates to its dealings with David Blaszczak, the founder of Precipio Health Strategies, said the person who asked not to be named because the New York-based firm is private. Deerfield buys shares of health-care companies and also makes private equity investments, according to its website.

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