It was a staffer for the mayor of Washington, DC:
http://www.washingtonpost.com/wp-srv/local/longterm/williams/williams020499.htm
And it's not an isolated occurrence, either:
Controversies about the word "niggardly"
In other news, the County of Los Angeles has banned the use of "master/slave" terminology by technology equipment vendors:
'Master' and 'slave' computer labels unacceptable, officials say
In that article:
The request -- which has some suppliers furious and others busy re-labeling components -- came after an unidentified worker spotted a videotape machine carrying devices labeled "master" and "slave" and filed a discrimination complaint with the county's Office of Affirmative Action Compliance.