<p>A letter-writing campaign by third-graders at Allis Elementary School encouraging an end to the war in Iraq was canceled because it violates School Board policy, district officials said Tuesday.</p>
<p>Julie Fitzpatrick, a member of the 10-teacher team that developed the project for the school's 90 third-grade students in five classes, said the assignment was intended to demonstrate citizen action, one of the district's standards in social studies.</p>