In '' Monkey Business '' , by Kathy Snow Guillermo , she writes that the first ALF action in the United States was the removal of the so-called Silver Spring monkeys , who were being cared for by the People for the Ethical Treatment of Animals ( PETA ) in a safehouse . They were kept there are after a researcher from the Institute of Behavioral Research in Silver Spring , Maryland , had blatantly acted in violation of the animal cruelty legislation for laboratory practice . The animals were then returned five days later , after learning that legal action against the researcher could not proceed without the monkeys
Silver Spring monkeys
Silver Spring monkeys
Timeline of Animal Liberation Front actions, 1976–99