The Detroit Free News reports that angry protesters interrupted a speech by Chrysler CEO Sergio Marchionne during the Automotive News World Congress dinner celebration in Detroit on Wednesday night, releasing balloons and passing out fliers critical of the company’s recent handling of labor issues.

The fliers pointed people to www.carbuyersbeware.com, which is a site that protests Fiat’s purchase of Chrysler. One protestor, who identified himself as a member of the Teamster’s strategic campaign division, said that he was protesting the company’s decision to start using nonunionized car haulers, saving the company $10 per car.