NEW ORLEANS — ACORN, the national activist group dogged by a high-profile voter registration fraud scandal, has another bruising item on its agenda when its board of directors meets here this weekend. Leaders of the Association of Community Organizations for Reform Now are locked in a legal dispute stemming from allegations that the brother of the group's founder misappropriated nearly $1 million of the nonprofit's money several years ago. The embezzlement case, a recent revelation to some board members, has spawned a lawsuit and set off a power struggle inside ACORN at a time when the liberal group's voter registration...