Police in Cannes are to stage a two-hour strike during the town's famous film festival later this month.
The Da Vinci Code will open this year's festival on 17 May
The walkout could disrupt security arrangements at the 12-day gathering, which is expected to attract stars including Tom Hanks and Kirsten Dunst.
Hundreds of officers are deployed in the French town during the festival.
Unions are hoping to grab the spotlight on the event's third day, 19 May. They will protest outside the event's headquarters, the Palais de Festivals.
Another walkout could take place four days later.
They aim to draw attention to a dispute over working conditions and the use of contractual staff and are demanding that the head of town security, Guy Heron, be sacked.
This year's festival will open with the world premiere of The Da Vinci Code on 17 May.
Festival organisers could not be contacted for comment.