Kevin Richard Olliff, 22, pleaded no contest Friday to felony stalking and conspiracy charges, a day after Linda Faith Greene, 62, pleaded guilty to similar charges. Both are affiliated with the Animal Liberation Front, an underground network of activists that has claimed responsibility for sabotaging animal research labs, setting fires, flooding properties and making death threats against researchers.

Last year, Los Angeles County grand jurors indicted Olliff and Greene on charges that they had harassed UCLA scientists who use animals in their research and held threatening protests near the homes of executives of the POM Wonderful juice company.

Olliff and Greene were among five activists named in a 2008 injunction that barred contact between animal rights activists and UCLA researchers.

As part of a negotiated settlement, prosecutors said Olliff signed a plea agreement saying “I admit that I am an animal rights activist who engaged in demonstrations targeting specific professors, researchers and business people at the personal residences and at their workplace, including the UCLA campus."

Olliff faces up to three years in state prison, and is scheduled to be sentenced in May