The builders who constructed the main stage at the 2011 Indiana State Fair have been fined more than $80,000 (£50,000) for failing to comply with proper safety regulations.
Seven people were killed and dozens more injured when the stage collapsed onto a crowd of fans as a storm swept through the Indianapolis fairgrounds in August (11) - right before country group Sugarland were due to perform.
Executives at the Indiana Department of Labor launched an investigation into the accident and workers at Mid-America Sound have now been cited for four violations, including failure to develop a risk assessment plan and failure to provide appropriate, qualified supervision.
Labor Department Commissioner Lori A. Torres tells CNN, "The evidence demonstrated that the Mid-America Sound Corporation was aware of the appropriate requirements and demonstrated a plain indifference to complying with those requirements."
However Mid-America Sound bosses are strongly disputing the new claims, insisting they're not the ones to blame.
Representative Byra Borshoff Cook adds, "Mid-America Sound was consistent and clear with the Indiana State Fair Commission about the limitations of the temporary roof structure in high winds or severe inclement weather. Despite these warnings, the Indiana State Fair Commission, who controlled the venue, and Sugarland, who controlled the concert, refused to postpone the concert and failed to implement an evacuation plan away from the temporary roof structure."
Sugarland returned to the scene of the tragedy in October (11) to play a free concert in honour of the victims and raise money for a charity set up in its wake.