In regard to your Aug. 5 editorial “Another Kind of Terrorist”: Lost in your discussion of the U.K.’s animal-rights woes is the fact that they have clear American parallels. Presently, the highest-profile cheerleader for Britain’s animal-rights thugs is California physician Jerry Vlasak, a longtime spokesman for the Washington-based Physicians Committee for Responsible Medicine (PCRM), which the better-known People for the Ethical Treatment of Animals (PETA) describes as a “related” organization.

At last year’s “Animal Rights 2003” convention in Los Angeles, Mr. Vlasak openly encouraged the murder of biomedical researchers whose work requires the use of animals, saying: “I don’t think you’d have to kill — assassinate — too many . . . I think for five lives, 10 lives, 15 human lives, we could save a million, two million, 10 million non-human lives.”

In 2003, animal-rights militants bombed two California biotech firms, including one responsible for much of this nation’s flu vaccine supply. Death threats are common among animal researchers, restaurant executives, leather and fur retailers, cattlemen and other professionals who refuse to embrace “animal liberation” in their business plans.

As you point out in your editorial, GlaxoSmithKline and the entire pharmaceutical sector may have no choice but to leave Great Britain. But as Huntingdon Life Sciences has already learned, the animal-activist climate is every bit as hostile on this side of the Atlantic.