Follow him or her home, write down the address, and publish it on the internet.
I think it is more of the principle of the situation, no one but the company should know where I live. Fortunate for me when we went through the decertification process I had moved and no one, not even the company knew my real address. Under that knew contract they went out on strike and took less than what was first offered. All of use that stayed made them put the clause that there would be no super seniority against all that stayed and did not go out on strike. Most if not all of the wigs are on first shift. So following them home is not an option for me.