sentences:  A campaign to end the system was launched and editor Henry Polak, a friend of Gandhi's, went to India to mobilise support.From 1906 onwards it became a vehicle for challenging state laws and urging defiance of these when these were clearly unjust.This tradition began during the satyagraha campaign between 1906 and 1913 which began because of attempts to impose passes on Indians in the Transvaal.