The underground group, which the FBI characterizes as a domestic terrorist organization, has issued a claim of responsibility for vandalizing the Lake Oswego home of Dr. Eliot Spindel.
A contractor on Tuesday discovered that Spindel's garage door had been spray-painted with a threat: "ALF eyes on you!"
"Our message to Eliot is simple: Quit the torture industry and issue an apology or we swear we will make an example of you," the ALF wrote in a claim of responsibility released late Thursday by the North American Animal Liberation Press Office.
Spindel's research at the Oregon National Primate Research Center in Hillsboro, a division of Oregon Health & Science University, has focused on blocking the damage that pregnant smokers do to their fetuses.
The researcher, who uses monkeys in his work, said in an interview Friday that he would neither apologize nor quit.
— Bryan Denson;