Guilds are official groups association of people for mutual aid or the pursuit of a common goal, they all do the same job in Artemis on the Moon.

Because of the group mentality they often end up strong arming those who aren't in guilds to join or put them out of business using rumor-mongering like the Welders' Guild attempted with Ammar Bashara and the Electricians' Guild attempted with Tyler. It also causes the EVA Guild to become quite shut off from those outside of their own guild.