Atlanta City Hall

A former city of Atlanta employee was sentenced to prison Monday in the ongoing public corruption investigation into alleged bribes paid for government contracts.

The case, according to prosecutors, involved a “shut up” message on a concrete block thrown through a window and dead rats left on the porch of the home of a federal witness.

Shandarrick Barnes, 41, was sentenced to three years and one month in prison for obstructing justice in the federal corruption investigation involving city government, U.S. Attorney Byung J. “BJay” Pak said in a news release. Pak said Barnes admitted he threw a concrete block through the window of E.R. Mitchell's home and put rats on his porch and elsewhere, hoping to stop his cooperation with federal law enforcement.