10/16/2011 12:45 am ET Updated Dec 15, 2011

Vincent Gray Campaign Under Vigorous Federal Scrutiny

Federal investigators digging into irregularities in the campaign of Mayor Vincent C. Gray have interviewed several of his associates and election staff members, subpoenaed reams of documents, and granted immunity to at least one witness who testified before a grand jury, according to nearly a dozen people familiar with the probe.

The criminal probe began after onetime mayoral candidate Sulaimon Brown alleged in March that he was paid by the Gray campaign to disparage then-Mayor Adrian M. Fenty during last year’s Democratic primary. Brown also claims that the Gray campaign promised him a city job in return for his political attacks on Fenty.

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