Federal prosecutors and investigators in Dallas acknowledged in court documents that they mistakenly gave defense lawyers information about the inner-workings of secretive counterterrorism investigations. It took federal officials four months to discover that in April they had turned over secret court applications for wiretaps, which often have sensitive information from U.S. and foreign intelligence agencies, according to court papers that were unsealed this week. The materials were given to lawyers for the Holy Land Foundation for Relief and Development and seven of its senior officers, who have been indicted on charges they illegally funneled millions of dollars to support the...