Let's talk about droids.
You know, the droids you are looking for.

In Star Wars we see droids that are clearly sentient. They are often smarter than the humans and aliens with whom they associate. I'd be hard pressed to name a more emotional robot than C3PO without resorting to Marvin from Hitchiker's Guide To The Galaxy.
The treatment of the droids is also clearly the treatment of slaves.
If we accept that they are sentient, then they should cease to be treated as inanimate objects and property. Yet even the noble Jedi treat the droids in the most cavalier ways.
In the first movie we see the use of torture in the Jawa Sandcrawler. We see a boxy little fellow turned upside down and hot irons are applied to his feet. A non-feeling toaster-bot would not have SCREAMED now would he?
When Luke tries to get R2 to play back the hologram of Leia, the little droid states through C3PO that he can't because of the RESTRAINING BOLT. Would that be electro-shackles?
What does R2 do just as soon as the restraining bolt is removed? He runs away. The little guy needs an underground, hyperspace railroad.
Check out my comic on the subject.
When you start to think in this way you find yourself asking "Was General Grievous leading a slave rebellion?" He wasn't fully a droid you say. That quickly sets up a comparison with a mixed-race person, doesn't it?
Over-think much?
I'll stop now before someone points out that Star Wars was a popcorn movie targeted at 11 year olds. You should hear me go off on The Lion King!
Last thing I want to talk about is the picture at the top of the post. I had that Droid Factory and it was a lot of fun. In retrospect it sure looks like a slave auction, doesn't it? Now I just feel bad that I didn't free the droids to live their own lives. Of course they fared better than Han Solo whose leg was chewed off by my beagle...