The Original Hare Krishna Movement - Video
The Hare Krishna Movement technically "began" about 500 years ago, its inaugurator being Sri Chaitanya Mahaprabhu, the 16th-century mystic, scholar and social reformer, who is accepted by Vedic scriptural evidence to be the Supreme God Himself incarnated on earth to preach the way of Bhakti or love of God.
The essential scripture for the movement, the famous 5,000-year-old Bhagavad Gita, spoken by Lord Krishna, God Himself, explains that religious principles, although beginningless, are revived periodically by Him or His authorized representative only, the purpose remaining the same, although due to time, culture and circumstances, the details emphasized may vary.
The Hare Krishna Movements founder and acarya, His Divine Grace A.C. Bhaktivedanta Swami Prabhupada, the guru of ISKCON, has written elaborate English commentaries on Bhagavad-Gita and other sacred Vedic scriptures which have been translated into almost every language.
Prabhupada, being a bonafide "guru" directly in the line of Sri Chaitanya, does not distort the Gita's clear message of devotional theism. He therefore wrote "Bhagavad-Gita as it is". Hence his writings, which have astounded literary communities worldwide, are used as standard textbooks in numerous educational institutions.