And Slyvia Robinson was stealin' and robbin' them  from Nas –
Carry On Tradition Lyrics on Genius   Ties with the previous
bars; veterans complaining they didn´t get paid. Partly since
hip hop wasn´t a big business back in the days, but mostly
because Slyvia Robinsin took all the profit for herself when
they were big.  She is credited as the driving force behind two
landmark singles in the genre; “Rapper’s Delight” by the
Sugarhill Gang, and “The Message” by Grandmaster Flash and the
Furious Five. Which narrows it down to which rappers Nas is
referring to or it´s just an example..