This is a very nice collection of well-developed NPCs, organised as a low-powered but coherent urban/biker gang that might be encountered in a post-apocalyptic township somewhere. (I think my Deadlands: Hell on Earth character would fit in well with them if he ever stops roaming around with his current party...)
There is a whole range of different types here. Many of them could make interesting encounters - or useful contacts - on their own. As a gang, they really shine giving a real impression of a functioning group of people doing their best to survive whatever apocalypse has struck your world... and who will continue to do so irrespective of whether or not the party is around or not - something you always want to achieve in creating a believeable alternater reality.
The details for each member of the gang are copious - appearance, nature, capabilities, what they have with them and what they are likely to be doing. All you need to do is add in any apposite game mechanics, but unless a brawl breaks out or you need them to attempt a task for which the outcome is not certain, you'll barely need any as you really know all you need to know about them from the write-up.