There is,of course,U.S. -British collaboration on covert activity in Iran, even if it is limited.

VOA: standard.2009.07.02

Colin Stetson plays the Baritone Saxophone. He says the collaboration is one of equals.

VOA: standard.2010.02.25

"Historically it's one of the most important parts of the period of World War II in France,the roundup - the rafle du Vel dHiv - is a symbol of collaboration between the French police and the German occupying authorities."

VOA: standard.2010.04.10