NAFF - North American Futsal Federation. Ironically https://www.urbandictionary.com/define.php?term=naff
I thought the USASL was the league that put a team in Amarillo or wherever it was and this MLF had some other indoor league on top of the complete-non-starter futsal league. But I could be completely wrong.
The MLF indoor league is also the USASL (originally it was the PISL until someone tried to read that aloud I imagine).