The Aguddas HaRabbanim should not be confused with the Agudath Israel of America (Agudas Yisroel) organization, or with the Union of Orthodox Congregations. The Union of Orthodox Rabbis of the United States and Canada also known as the Agudas HaRabbanim (or Agudath Harabonim) ("union of rabbis"), and sometimes as the UOR, was established in 1901 in the United States and is among the oldest organizations of Orthodoxrabbis which could be described as having a Haredi worldview. It was originally aligned with the Orthodox Union; in later years, the Orthodox Union drifted apart from the Agudas HaRabbanim, and closer to the relatively Modern OrthodoxRabbinical Council of America (RCA).
See more at Wikipedia.org...