There are White and Mexican bloods and crips so why not? (said sarcastically). This guy got a fairly big following on youtube.
I have also seen whites in black greek organizations. I (and thankfully my chapter) was adamant, no non blacks. If you were non FBA you had to be down. It wasn't explicitly said but it was implied. International African and Caribbean students on campus tryna clout chase didn't get past the interview process. I met a Somali Que overseas, cool dude.