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Rose McGowan is wasting no time -- shortly after getting back on Twitter she launched an attack on Jeff Bezos and Amazon Studios ... but it's still all about Harvey Weinstein.

Rose posted a pic of a female samurai with the caption "it's on" ... then lit into Bezos over a blown script deal and Weinstein. Rose claims she told the head of Amazon Studios Weinstein had sexually assaulted her.

1) @jeffbezos I told the head of your studio that HW raped me. Over & over I said it. He said it hadn’t been proven. I said I was the proof. @rosemcgowan

She also hints Bezos and Amazon were going to sell her script to The Weinstein Co. -- or as she put it ... "a Weinstein bailout" -- which would clearly piss her off.

There's a lot more, but Rose's bottom-line is she wants Bezos to "stop funding rapists, alleged pedos and sexual harassers."

5) @jeffbezos Be the change you want to see in the world. Stand with truth. #ROSEARMY #Amazon @rosemcgowan

As we reported, Twitter blocked Rose's account after she posted someone's phone number ... but she's not backing down from her public attacks on Hollywood power players.