http://talkingpointsmemo.com/muckraker/how-lieberman-got-amazon-to-drop-wikileaks

The Electronic Frontier Foundation, a group that advocates for Internet freedom of speech by defending court cases, said the axing certainly doesn't violate the First Amendment. But it is, according to senior staff attorney Kevin Bankston, "disappointing."

https://www.eff.org/deeplinks/2015/12/sheriffs-threats-against-credit-card-companies-violate-first-amendment

As we wrote about last month, we submitted an amicus brief to the Seventh Circuit arguing that government officials such as Sheriff Dart may not use their positions of authority to coerce companies with express or implied threats of legal liability into taking actions that censor speech—whether online or offline.

As we all know, escort services are important, not Wikileaks, whose founder makes use of the CIA's escort service with expected results.