Pine Ridge, S.D. ? In a desperate effort to fight the ravages of alcoholism on the Pine Ridge Indian Reservation, leaders of the Oglala Sioux tribe are threatening to set up roadblocks today and stop members from bringing in beer bought at four outlying stores.

Alcohol has long been banned on the 16,500-member reservation, where drinking has been a scourge for generations. But four stores in Whiteclay, Neb., a dusty village a few hundred feet outside the reservation, sell an estimated 4 million of cans of beer every year, mostly to Indians.

Tribal members said that from now on, they will confiscate beer bought in Whiteclay.

Alcoholism is frighteningly high on the reservation, though how high is unclear. The effects can be seen in nearly every family, in accidents, violence, sexual abuse and suicide, said Terryl Blue-White Eyes, director of the alcohol and drug program for the reservation.