The hacker group Anonymous is reported to be preparing for a cyber-attack on corporate sponsors of the World Cup in Brazil which begins on June 12 in Sao Paulo Brazil. Why? As disclosed by an inside hacker, the group wants to protest the lavish spending on the soccer games in a country struggling to provide basic services.

Earlier this week, Anonymous attacked the Brazil’s Foreign Ministry computer networks and leaked dozens of confidential emails. A hacker who operates under the alias of Che Commodore has reported that they have already conducted late-night tests to see which of the sites are more vulnerable. Likely targets that he named included Adidas, Emirates airline, the Coca-Cola Co and Budweiser, which is owned by Anheuser-Busch InBev.

The threat of cyber-attacks is yet another headache for the organizers of the World Cup kicking off on June 12 in Brazil. The 32-nation soccer tournament has already been marred by embarrassing delays in the building of stadiums and widespread discontent in Brazil over the excessive cost of hosting the event in a country with deficient public services.

In what could be the biggest cyber-security breach since the U.S. National Security Agency allegedly spied on President Dilma Rousseff’s personal communications, Anonymous this week posted 333 documents extracted from the Foreign Ministry’s computing network. They include a briefing of talks between Brazilian officials and U.S. Vice President Joe Biden during a visit to Brazil in May last year and a list of sport ministers that plan to attend the World Cup.