This one is kind of weird - basically, you need to target them with the trigger in the middle of doing the proper tasks. So for example, catch the farmers while they're milking cows, the tailor knitting, etc. It's the sort of things you'd expect to find in the "Encyclopedia of the Common Man". Generally you'll probably have to leave the area and come back a lot to easily see everything. (I don't have a full list of activities handy but I can maybe try to collate one later when I'm back in front of the game.)
I literally just did this!
The clues are in a letter you find, and they are as follows:
UNDER ALL CIRCUMSTANCE-OBEY AND BALANCE THE MORAL LAW
THE GLOBE OVER
BE IT CHRISTIANITY OF THE WEST
BUDDHISM OF THE EAST
The BALANCE is represented by the scales of justice. The globe is the GLOBE, obviously. The cross symbolizes CHRISTIANITY, and the steering wheel is a symbol for BUDDHISM.
Based on the last two lines, Christianity is of the West, so the cross goes on the left. Buddhism is of the East, so the wheel goes to the right.
Then, for the first two lines, the moral law is to be obeyed under all circumstances, so the scales are on the bottom. Furthermore, the moral law must be obeyed all over the globe, so the globe is on top.
Best Answer
Here's a winning set up:
The top middle white piece can move up and down between two mills - at this point they can keep repeating to remove all black's pieces.
Here is a video with more detail.