I’m not talking about kindergarten playtime or its “adult” equivalent … politics.
Any time multiple employers are involved, labor and employment matters becomes much more complicated. The classic example is a construction site. OSHA refers to such settings as “multi-employer worksites.” Multi-employer sites are not limited to construction sites. Do you use temps? Have contractors or consultants performing work onsite? Maintain locations in malls, resorts, or arenas? Host trade shows? Build autos, aircraft or ships? On occasion, every worksite becomes a “multi-employer site.