was alleged to have illegally interfered with the election, as described in Article 33 of the constitution of Mexico. While Hugo Chávez was President of Venezuela at the time he made his comments, José María Aznar was not head of government of any nation when he made his comments. Additionally, Hugo Chávez made his comments in public and through broadcasting media, while Aznar's comments were made in a private meeting with PAN members and were not intended for broadcasting. Zavala accusations On June 6, during the second presidential debate, López Obrador alleged that Calderón's brother-in-law, Diego Heriberto Zavala Gómez, had failed to pay taxes on earnings of two and a half billion pesos that Zavala had obtained in favorable government contracts obtained while Calderón was Energy Secretary. López Obrador called Zavala the cuñado incómodo (inconvenient brother-in-law), a play on the nickname inconvenient brother of Raúl Salinas de Gortari. The Calderón campaign and Zavala denied the accusations. El Universal reported on June 8 that according to Compranet, the government's procurement database, Zavala had three contracts related to the energy sector, all of them after Calderón had left office; and that his companies had a total of 18 contracts since 2003, totaling 129 million pesos. On Friday June 9, 2006, López Obrador promised to deliver documentation that would prove the allegations. Later that day, Claudia Sheinbaum from the López Obrador campaign arrived at Calderón campaign headquarters with three filing boxes. They were met outside by the vice-coordinator of Calderón's campaign, and by the press and a notary public who had been called by the Calderón campaign. The vice-coordinator of the campaign insisted that the boxes be opened and the contents catalogued and witnessed by the notary public before they were brought inside. A verbal confrontation ensued; during this confrontation, the boxes were opened and it was found that they were almost empty and contained only a handful of copies of documents the PRD had made public previously, and three CDs. Sheinbaum attempted to explain what the contents were, but a shouting and shoving match began among PAN and PRD members present. The accusations against Zavala were discontinued after the confrontation, though they were never withdrawn. Federal Electoral Institute corruption allegations In April 2006, amid allegations that one of Felipe Calderón's brothers-in-law, Diego Hildebrando Zavala Gómez del Campo, was involved in the elections, the IFE declared that Hildebrando company did not participate in