The phrase "extreme fringes" refers to a small, radical group or a minority within a larger group that holds extreme or unusual beliefs or ideas. Full definition
Its more extreme fringes were repressed. (artslant.com)
Failure to comprehend is merely one of the examples of cognitive dissonance in a movement that is overwhelmingly extreme fringe liberal. (judithcurry.com)
Yea, characterize the whole religion by the actions of the extreme fringe. (religion.blogs.cnn.com)