Nearly 3,500 film professionals back the petition.
Prominent figures in cinema are voicing their concerns.
The petition aims to challenge Bolloré's influence in the industry.
Heavyweight support: Javier Bardem, Ken Loach, Mark Ruffalo, Aki Kaurismäki and Yorgos Lanthimos have joined an op-ed denouncing Vincent Bolloré’s grip on cinema.
Nearly 3,500 film professionals back the petition.
Prominent figures in cinema are voicing their concerns.
The petition aims to challenge Bolloré's influence in the industry.