Former IRS executive Lois G. Lerner told a federal court last week that members of her family, including “young children,” face death threats and a real risk of physical harm if her explanation of the tea party targeting scandal becomes public.... Ms. Lerner and Holly Paz, her deputy at the IRS, filed documents in court Thursday saying tapes and transcripts of depositions they gave in a court case this year must remain sealed in perpetuity, or else they could spur an enraged public to retaliate.