uu - Universal Union: aka combine
cwu - Civil Workers Union: job man
first, go to spawn and press f4 then you will see 3 options in job options
industrial workers: do laundry in work area
commercial workers: food seller
medical workers: medic, doctor
For gameplay function, you are able to do what was described above by other users such as @sem_daniel. However, you can also play as CWU if you simply want to roleplay.
Here are some RP ideas for CWU:
Civil Engineering Corps: You can flag on as an industrial worker and build a headquarters. You and your team can go around the city fixing various pieces of technology and equipment.
Rapid Medical Response Team: You can flag on as a medical worker and build a small team of people that are sort of like EMTs for civilians. They can pm you their location (in RP they'd be using their personal request device) and you can go give them emergency medical treatment.
Civil Decontamination Team: You can flag on as a medical worker and do diseaseRP. Have an apartment block shut down, quarantine the infected, work with the CPs, and even maybe use E2 to give yourself some PPE.
Pest Control Team: You can flag on as an industrial worker and RP as exterminators for household pests (I actually saw two people do this once and it was awesome). Go from door to door removing small animals and bugs from people's homes.
Really, you can do whatever you want as CWU. You are only limited by your own creativity and imagination.