There's a couple of influential underground hip hop acts from there, some of them sharing members with hardcore bands like Spazz or Plutocracy. So it's not a total surprise if that EP was released in 2001 on a hardcore-centered label, Family Of Resistance.
USF stands for United Sicko Foundation or Unstoppable Force and includes, amongst others, members Stinkweed (RIP, also part of 152 other Bay Area bands) and DJ Eons One, who produced some of the cuts.
If you like this EP don't forget to check the post-mortem Stinkweed Bandcamp put together by Eons, there's most of his rap-related work for free download. Some of the Shed Dwellaz material has been recently reissued by Ormolycka on cassette btw.
Puff Dank Stuff Bank
Don't Fuck With The Doom Crue
Hands Of Doom(Ryde)
Tape Out The Deck
What A Long Strange Dip It's Been