Mayor de Blasio and Cynthia Nixon’s wife banded together with a bunch of City Hall aides in an effort to stop singing star Jennifer Hudson from performing at a Success Academy rally — by feeding her negative information about the charter network, ­e-mails obtained by The Post show.

The political conspiracy’s cast of characters included several top mayoral staffers and Christine Marinoni, who is Nixon’s wife and was working for the administration at the time.

De Blasio and his crew sprung into action when City Hall learned from news reports that the “Dreamgirls” star would be headlining at an October 2015 Success rally in Brooklyn and moved quickly to undo the deal.

Then-Deputy Mayor Richard Buery was tapped to “inform” the singer — a charter school supporter — about supposed problems at Success, which is run by de Blasio nemesis Eva Moskowitz.