In an interview, a Burger King executive told me that the company had worked with Diplomatic Tactical Services for years on “security-related matters” and had used it to obtain information about the Student/Farmworker Alliance’s plans — in order to prevent acts of violence. “It is both the corporation’s right and duty,” a company spokesman later wrote in an e-mail message to me, “to protect its employees and assets from potential harm.”

But the Student/Farmworker Alliance and the Coalition of Immokalee Workers are not dangerous, extremist groups. Both are pacifist, mainstream nonprofits inspired by the work of the Rev. Dr. Martin Luther King Jr. The coalition is supported by the Robert F. Kennedy Memorial Foundation, the Presbyterian Church (U.S.A.) and Pax Christi, the Catholic peace movement.