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Casanova[1] and other NYC rappers appear to have been effectively blackballed from performing in their own town by the NYPD, getting nixed from Rolling Loud after a mere request.

A letter that's purported to have been written by the City of New York and signed off by Asst. Police Chief Martin Morales surfaced over the weekend, and it appears to show the NYPD asking Rolling Loud organizers to block Casanova and co. from getting on stage.

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The letter -- addressed to the company behind Rolling Loud, Insomniac, LLC -- reads ... "The New York City Police Department requests that the below individuals be removed from performing at the 'Rolling Loud Festival' taking place at Citi Field on Saturday October 12, 2019 and Sunday October 13, 2019, due to public safety concerns."

It goes on to list 22GZ, Casanova, Pop Smoke, Sheff G and Don Q as artists who shouldn't be allowed to perform -- with cops citing affiliation to recent acts of violence in the city.

They say it quite clearly ... "The New York City Police Department believes if these individuals are allowed to perform, there will be a higher risk of violence. I look forward to working with you in an effort to keep this event safe."

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It would seem the letter -- and the not-so-subtle plea -- was taken to heart, because Casanova announced he was, in fact, not performing ... and wasn't happy about it.

On IG, the rapper -- who's had past beefs[2] with Tekashi 6ix9ine[3] -- wrote in part ... "My last felony conviction was 2007. I lost everything I ever loved and I’m STILL losing. So much so that 'they' won’t allow me

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