The haredi camp encompasses both a number of hasidic sects and the spiritual descendants of their no less pious historical antagonists: the mitnagdim, or opponents of Hasidism, since that movement’s emergence in the 18th century. In the metropolitan New York area, haredim tend to cluster in enclaves like Williamsburg, Boro Park, and Crown Heights in Brooklyn and certain neighborhoods of Queens, as well as Lakewood, New Jersey and a couple of upstate New York counties. Haredi communities also exist in such cities as Baltimore, Los Angeles, and Chicago. Wherever they are, the haredim have distinguished themselves not only by their aloofness from much of Western culture and learning, or by the wary distance they maintain in social interactions with Gentiles, but also by their self-segregation from their fellow Jews, emphatically including the Modern Orthodox—and precisely because of the latter’s accommodation of American mores, openness to the wisdom of the Gentiles, and willingness to interact with non-Orthodox Jews and their leaders.
Jack Wertheimer, “Can Modern Orthodoxy Survive?”, Mosaic (August 2014) [http://mosaicmagazine.com/essay/2014/08/can-modern-orthodoxy-survive/]