On Thursday, as former Nassau County Executive Edward Mangano prepares to stand trial within the coming weeks on corruption charges, federal authorities unsealed an indictment alleging that Mangano’s former chief deputy lied to the FBI about taking money from a contractor.

The two-count indictment for Richard Walker, 43, is the latest set of federal charges filed in recent years against a top-level operative in Nassau County politics, and comes after a an investigation of more than two years into allegations that Walker steered government contracts to donors.