Don't you mean kill -9 1 ?
kill 1 kills the process with the PID of 1. Very polite.
-9 means that you really want to kill it.... as in "DIE YOU MUTHA-FSCKING RAT PIG ..." well you know how it goes.
Now going from memory because I'm too fscking lazy to google it... but isn't kill -13 <pid> used to not only kill the process, but all of those evil children the process spawned from Satan?
Didn't you know the BSD devil imp is really meant as a warning!!!