The probe into the Rev. Al Sharpton's finances intensified this week, with the IRS sending out a flurry of subpoenas to his most generous corporate donors, The Post has learned.

Anheuser-Busch, the brewer of Budweiser and Michelob, confirmed yesterday that it received a federal subpoena in connection to its charitable giving to Sharpton's National Action Network.

"We have received a subpoena and are cooperating with the IRS," the company said in a statement.

Sharpton blasted the subpoena as a "fishing expedition" and said his donors are proud of their financial support. The St. Louis-based corporation donated between $100,000 and $499,000 to NAN in 2007 alone, according to its Web site, but declined further comment about its relationship with Sharpton. A knowledgeable source said several other corporate donors received or would soon receive subpoenas.

Sharpton himself, his business entities and his nonprofit civil-advocacy group owe millions in back taxes, documents show.

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