As some days may happen
That a victim must be found
I've got a little list
I've got a little list
Of society offenders
Who might well be underground
And never would be missed
They never would be missed

Who wrote this please?

A quick and easy Googling uncovered this --

I've Got a Little List - Family Guy Wiki

YouTube performance of I've Got a Little List - Mikado

W. S. Gilbert's entire song and setting details

Thank you. A friend sent it to jog my memory. I forgot where from, but thought G&S. Don't know family Guy but will look it up.
Best regards.