A group of four former Google employees who say they were fired for organizing are filing unfair labor practice charges against the company (Shirin Ghaffary/Vox)

Shirin Ghaffary / Vox:
A group of four former Google employees who say they were fired for organizing are filing unfair labor practice charges against the company  —  The move is the latest escalation in growing tensions between employee organizers and management at the search giant.