The Hare Krishna movement is a part of Hinduism. Its official name is Gaudiya Vaisnavism. Gaudiya refers to the region of India presently known as Bengal; Vaisnava refers to one who worships the deity Vishnu or Krishna. At least half of the Hindu population would consider themselves Vaisnavas. So, basically, the Hare Krishnas are worshippers of Krishna from the Bengal region.