My Crain's email alert on this just popped into the inbox. White collar outsourcing continues.

[snip]
"General Motors Co. confirmed this afternoon plans to move all the remaining Chevrolet advertising work away from Warren-based Campbell-Ewald to a rival — ending a relationship dating back to 1919."
...
“Over the coming months we will transition the business to Publicis Worldwide, which has recently been handling our car and crossover brands.” [Paris-based rival advertising holding company Publicis Groupe SA, owns Worldwide.]

Campbell-Ewald will retain some non-Chevrolet GM work, said Klaus-Peter Martin of Chevy communications. He declined to say what the work is, and could not provide any other details on the agency shift.

http://www.crainsdetroit.com/article.../100429911/-1#