Canadian Press: Unexpected visitors have been dropping in on anti-oil activists in the United States - knocking on doors, calling, texting, contacting family members.
The visitors are federal agents.
Opponents of Canadian oil say they've been contacted by FBI investigators in several states following their involvement in protests that delayed northbound shipments of equipment to Canada's oilsands.
A lawyer working with the protesters says he's personally aware of a dozen people having been contacted in...