PUERTO CABELLO: When hunger drew tens of thousands of Venezuelans to the streets last summer in protest, President Nicolas Maduro turned to the military to manage the country's diminished food supply, putting generals in charge of everything from butter to rice.

But instead of fighting hunger, the military is making money from it, an Associated Press investigation shows. That's what grocer Jose Campos found when he ran out of pantry staples this year. In the middle of the night, he would travel to an illegal market run by the military to buy corn flour — at 100 times the government-set price.

"The military would be watching over whole bags of money," Campos said. "They always had what I needed."

With much of the oil country on the verge of starvation and malnourished children dying in pediatric wards, food trafficking has become big business in Venezuela. And the military is at the heart of the graft, according to documents and interviews with more than 60 officials, company owners and workers, including five former generals.

As a result, food is not reaching those who most need it.

The US government has taken notice. Prosecutors have opened investigations against senior Venezuelan officials for laundering riches from food contracts through the US financial system, according to several people with direct knowledge of the probes. No charges have been brought.

"Lately, food is a better business than drugs," said retired Gen. Cliver Alcala, who helped oversee border security.

The late President Hugo Chavez created a Food Ministry in 2004. His socialist government nationalized and then neglected farms and factories, and domestic production dried up. When the price of oil collapsed in 2014, the government no longer could afford to import all the country needed.

Hungry Venezuelans began rioting, and so Maduro handed the generals complete power over food. The government now imports nearly all the country's food, and corruption drives prices sky-high, said Werner Gutierrez, agronomy professor at the University of Zulia.

"If Venezuela paid market prices, we'd be able to double our imports," Gutierrez said. "Instead, people are starving."

In large part due to concerns of graft, the three largest global food traders, all based in the US, have stopped selling directly to the Venezuelan government.

One South American businessman says he paid millions in kickbacks to Venezuelan officials as the hunger crisis worsened, including $8 million to people who work for the food minister, Gen. Rodolfo Marco Torres. The businessman insisted on speaking anonymously because he did not want to acknowledge participating in corruption.

He explained that vendors like him can afford to pay off officials because they build large profit margins into what they bill the state. A single $52 million contract of his to import yellow corn last year, seen by AP, included a potential overpayment of more than $20 million, compared with market prices at the time.

Marco Torres did not respond to requests for comment by phone, email and hand-delivered letter. In the past, he has said he will not be lured into fights with an unpatriotic opposition.

Some contracts go to companies that have no experience dealing in food or seem to exist only on paper. Financial documents obtained by AP show that Marco Torres did business with Panama-registered Atlas Systems International, which has all the hallmarks of a shell company. Another government food supplier, J.A. Comercio de Generos Alimenticios, lists on its website a nonexistent address in an industrial city near Sao Paulo, Brazil.

The two companies transferred more than $5.5 million in 2012 and 2013 to a Geneva account controlled by the brothers-in-law of the then-food minister, Gen. Carlos Osorio, according to bank and internal company documents seen by AP.

Osorio, recently appointed to oversee transparency in the military, did not respond to requests for comment, but in the past dismissed charges of corruption as personal attacks from the opposition.

The socialist administration says it takes graft seriously.

"The state has an obligation to root out corruption in all levels of public administration," the defense minister, Gen. Vladimir Padrino Lopez, said this fall.

And yet dirty dealing persists from the port to the markets, according to dozens of people working in Puerto Cabello, which handles the majority of imported food. Officials sometimes keep ships waiting at sea until they are paid off, according to a stevedore who spoke anonymously because he feared losing his job.

After the cargo is unloaded, customs officials take their cut, refusing to even start the process of nationalizing goods without a payment, four customs workers said, .

"It's an unbroken chain of bribery from when your ship comes in until the food is driven out in trucks," said Luis Pena, a director at the Caracas-based importer Premier Foods.

If importers try to get through the process without greasing the wheels, food sits and spoils, Pena said. Rotting food is a problem even as 90 percent of Venezuelans say they can't afford enough to eat. The demands for bribes delay shipments, and state officials sometimes neglect to distribute what they import.

Puerto Cabello crane operator Daniel Arteaga watched last winter as state workers buried hundreds of containers of spoiled chicken, meat and beans.

"All these refrigerated containers, and meanwhile people are waiting in food lines each week just to buy a single chicken," Arteaga said.

The corruption doesn't stop once cargo leaves the port, according to truck drivers. The military has set up checkpoints along highways to catch food traffickers, and truck drivers say they have to pay bribes at about half of them.

At the end of the food chain, some soldiers partake in selling food directly to citizens, according to business owners. Bakery owner Jose Ferreira cuts two checks for each purchase of sugar: one for the official price of 2 cents a pound and one for the kickback of 60 cents a pound. He keeps copies of both checks in his books, seen by the AP, in case he is ever audited.

"We have no other option," he said.