Did someone once try to "stow away" on a Soyuz cargo rocket?

It’s perhaps a silly question, but…I seem to recall reading somewhere that a worker at Russia’s Baikonur launch center once tried to “stow away” on a Progress cargo rocket that was to be launched to a space station.

Of course, his plans were discovered months before the spacecraft got anywhere near the launchpad, so the story went.

Now…was this story true, or was it just a NyQuil-induced delusion?

"Despite a stowaway - a ‘super Florida mosquito’ "

http://www.astronautix.com/project/astp.htm

Thank you for the link, Oat, but I’m pretty sure that that isn’t the story I was thinking of.