Kool G Rap pioneered the mafioso shyt but Raewkon popularized it. G Rap was never on top of the world like Wu was in the mid 90s, so Rae pushed that content to the forefront. Nas himself said he got the mafia Escobar shyt from Wu-Tang.
But yeah, G Rap is basically the origin of it.
Fred.
I think this verse explains it pretty well:
Y'all don't know about my Biggie wars
Who you thought 'Kick In The Door' was for?
But that's my heart, y'all still trippin of this Jigga shyt
Real nikkas listen up and I'mma tell you how the whole thing start
Off top I brung Queens up from hard times
Rockin at the Fever, streets was all mine
It was my version of the blues, droppin our schools
The crack epidemic had rap representin new rules
So I, got in em shoes, tried em wore them
Wasn't a perfect fit, so I couldn't sport em
Young murderers ride, I knew all them
Jungle got shot, Will died, we was warring
I wrote it in my album
I was 18 when Lake seen the Island
And Lord held me down and
My surroundings started changing
I had a baby, I was making my rounds with AZ
nikkas started noticing my flow and was open when
The Golden Child closed em in with more style than them older men
Puff tried to start a label, Prince Rakeem had formed Wu-Tang
Snoop and Dre had a new thang
So Puff drove his new Range through Queensbridge Projects
He let me drive it, before Ready to Die hit
BIG and I hit blunts performing at the Arc
Next thing you knew, BIG blew and all the balling starts
He had Kim and his crew, I found Fox, only nikkas in New York with number
One charts
BIG was ahead of his time, him and Raekwon my nikkas
But dig it, they couldn't get along
That's when Ghostface said it on the Purple tape
Bad Boy biting Nas album cover way(?)
BIG told me Rae was stealing my slang
And Rae told me out in Shaolin BIG would do the same thing
But I borrowed from both them nikkas
Jigga started to flow like us, but hit with 'Ain't No nikkas'
Had much Versace swagger
BIG admired the Brooklyn knight and it took him in as Iceberg the rapper
Today don't know nothing, about this bullshyt
There's more shyt than wanting to be this King of New York shyt