Crooked Hillary!

Except the people who do know the law said this wasn't an instance of that;

"Federal campaign finance law prohibits political campaigning from coordinating on expenditures with outside groups that involve paid media communications. That means that the Clinton campaign and the super PAC supporting Clinton’s bid, Priorities USA Action, cannot write advertisements together, for example, or share data in order to decide what market to place an advertisement in.

It is legal, however to coordinate on other forms of communication, including certain types of messaging, and to contract work to third parties. The Donald Duck activists likely do not qualify under federal law as public communications, which is defined as including television or newspaper advertising, or mass mailings."

selective information, nice.
It's not clear-cut. It's at the very least a legal gray area, though more on the edge of "yeah it's illegal". Meaning that Clinton likely isn't going to be found guilty, but if the tables were turned Trump's campaign would be thrown through the grinder.
Even everyone's favorite socialist, Bernie Sanders, as noted in the same article you referenced, affirms that this violates the law as it was intended by the drafters.