From the Presbyterian Child Advocacy Office:
The United Nations Children's Fund (UNICEF) and the PC(USA) have long had a special relationship. Why? Because Trick-or-Treat for UNICEF was initiated by the Rev. Clyde Allison, a Presbyterian minister. Allison's children and others from their church's youth group covered milk cartons with orange paper, dressed up as children from other countries and collected change instead of candy, raising $17 that first year. The tradition continued and was eventually taken over by UNICEF.
Sadly, this year marks the passing of Clyde Allison, who died in Lowell, Indiana, in April. He leaves behind the rich legacy of thousands of children worldwide whose lives have been saved or extended through the pennies, nickels, dimes and quarters collected by other children.