Communes, collectives, and intentional communities regained popularity during this era. Early communities, such as the Hog Farm, Quarry Hill, and Drop City in the US were established as straightforward agrarian attempts to return to the land and live free of interference from outside influences. As the era progressed, many people established and populated new communities in response to not only disillusionment with standard community forms, but also dissatisfaction with certain elements of the counterculture itself. Some of these self-sustaining communities have been credited with the birth and propagation of the international Green Movement.