They even showed them in one episode when Tasha had a hallucination about being back on Mad Max World. They came after her with flash lights while she was hiding in a tunnel, holding on tightly to her cat. *cringe*
That's why I actually really like her anti-drug speech, I don't know why exactly it is so maligned. Nothing she says is wrong, and it's a realistic aspect of her growing up on a hellhole planet where many people would use hard drugs to escape reality. And at least it is *one* thing we learn about her past and planet that didn't involve those damn gangs.
Actually it might have been a much less cringe-worthy thing if Tasha had told Data "I learned to survive under the drug cartels" it still gives the same message, just a little less cringe-worthy.