The letter, published in French daily Libération and signed by figures including actress Juliette Binoche, reflects wider tensions in France over Vincent Bolloré’s expanding media empire and perceived political influence.
The debate comes as international stars begin arriving in Cannes for a festival that will welcome big names including Scarlett Johansson, Adam Driver and John Travolta.
FRANCE 24's Culture Editor Eve Jackson reports from Cannes.
