Leftists charged in a suspected bombing plot in California allegedly told an undercover FBI informant of their radical intentions several times before their Friday arrest, even mentioning a “terrorist diary,” court records show. The paid informant and an undercover FBI agent were key to infiltrating the leftist group Turtle Island Liberation Front (TILF) and disrupting its alleged New Year’s Eve terrorist plot, the FBI said in a criminal complaint filed Saturday. Defendant Zachary Page said during a December in-person meeting — which included the unnamed informant and agent — that he was “100,000 percent” sure the FBI would certainly be...