The fact
The journalist has been imprisoned in Algeria for over a year for "apology of terrorism."
His public support increases pressure on Algerian authorities.
5 sources — click a link to read an article on the topic:
Why it matters
L'intervention de Zidane, figure médiatique majeure, met en lumière le cas de Gleizes et pourrait accélérer les discussions diplomatiques entre la France et l'Algérie.