In the world of Windswept, people sign long contracts with conglomerates to become Indentures. Part of that contract is that you have a tattoo on your cheek denoting your field of expertise. These tattoos are fashionable, flattering, and they hurt like hell when applied.
When people Breach their Indenture and sign up with the Universal Freelancer’s Union, they get another tattoo, one of the Union’s logo, a clenched fist. It’s a reminder that an injury to one is an injury to all, and that all will pound the bejeezus out of anyone who starts something.