In a modern-day echo of the raucous Old West, small towns enjoying a boom in oil and gas drilling are seeing a sharp increase in drunken driving, bar fights and other hell-raising, blamed largely on an influx of young men who find themselves with lots of money in their pockets and nothing to do after they get off work.

Authorities in Pennsylvania and other states are quick to point out that the vast majority of workers streaming in are law-abiding. But they also say the drilling industry has brought with it a hard-working, hard-drinking, rough-and-tumble element that, in some places, threatens to overwhelm law enforcement.