Noun
a mob that kills a person for some presumed offense without legal authority
Source: WordNetThere's a whiff of the lynch mob or the lemming migration about any overlarge concentration of like-thinking individuals, no matter how virtuous their cause. P. J. O'Rourke
The Federal courts... surrendered to racist mob psychology as cravenly as any law officer ever did in the Reconstruction South under pressure from a lynch mob. Suddenly, mass bigotry was more dominant in the so called halls of justice in 1995 than it had been in 1955. Carl Rowan
At the United Nations, a lynch mob for Israel is always just a moment away. Elliott Abrams