Haredi Judaism
Haredi Judaism is not an institutionally cohesive or homogeneous group, but comprises a diversity of spiritual and cultural orientations, generally divided into a broad range of Hasidic sects, Litvishe-Yeshivish streams from Eastern Europe, and Oriental Sephardic Haredim. These groups often differ significantly from one another in their specific ideologies and lifestyles, as well as the degree of stringency in religious practice, rigidity of religious philosophy, and isolation from the general culture that they maintain.
Messianic Judaism
Currently there are over 300 Messianic Jewish congregations in the United States with maybe half of their attendance being Gentiles. Most of these congregations belong to the International Association of Messianic Congregations and Synagogues (IAMCS), an arm of the Messianic Jewish Alliance of America (MJAA), or to the Union of Messianic Congregations (UMJC) or to Tikkun International.