A "rival group" refers to a group of people or organizations that competes against each other for the same goals, resources, or achievements. Full definition
To keep rival groups at bay, one scientist, who wanted to remain anonymous, patented a group of enzymes used in brewing to the control quality of beer. (newscientist.com)
In the days following this weekend's violent clashes between rival groups of protesters in Charlottesville, Virginia, that resulted in the death of Heather Heyer, a 32 - year - old legal assistant with the Miller Law Group, some corporate executives have openly criticised President Donald Trump for his immediate failure to condemn white supremacists. (legalweek.com)
Shortly afterwards, while referee Mark Clattenburg counsulted with Uefa officials about how to proceed, fighting broke out between rival groups of Croatian supporters. (worldsoccer.com)