[5] By then a known name in Argentine media for her crusade against corruption and confrontations with Kirchnerite officials,[7][8] Alonso became notorious in 2015 for her friendship with Alberto Nisman, a federal prosecutor who was found dead days before publishing a 288-page report with incriminating evidence on then-president Cristina Fernández de Kirchner's involvement in the 1994 AMIA bombing cover-up.

"[11] During her time at the AO, the agency published more than 90 thousand affidavits regarding assets from officials of the Executive Branch and legislators in the National Public Data Portal within the Ministry of Modernization.

[5] During her tenure at the AO, the following bills and decrees were enacted, among others: The Anti-Corruption Bureau intervened as a complainant in more than 35 cases for corruption offenses within the scope of the Federal Government, including the 2012 Buenos Aires rail disaster,[16] the Hotesur,[17] Ciccone[18] and Qunita[19] scandals; the trials against Lázaro Báez,[20] Carlos Liuzzi,[21] José López,[22] Amado Boudou[18] and César Milani,[23] as well as a case of bribes and kickbacks in the Ministry of Health.

The Anti-Corruption Bureau was criticized for emitting complaints in this regard only against opponents of the government of which it is a part, for which it was charged with "manifest bias" and accused of using its function "to prosecute adversaries.

"[26] In September 2016, the AO decided to recommend that Aranguren must detach himself from his Shell shares as well as let him know that in matters related to the company he must refrain from intervening and designate an official in his replacement.