Speaking at a press conference, Leakey said that organised crime was a parallel centre of power in the country, depriving the state of a large share of revenue.
Some of those criminal networks collect funds for persons indicted for war crimes, Leakey said.
The threat of organised crime is so great that EUFOR has decided to make its potential available for the fight against organised crime, he said.
For example, EUFOR helicopters have been used for night-time surveillance and for tracking down trucks carrying illegal cargo.
Leaky said that EU soldiers would continue to cooperate with local police, the state border service and the department for indirect taxation, the general said.
According to the department, an additional 15 million euros of taxes was collected thanks to increased police activities.
So far EUFOR operations have been mostly directed towards preventing the smuggling of oil, illegal felling of trees, and drug smuggling.
In one operation alone, 27 kilograms of heroin has been seized on the Bosnian-Serbian border, Leakey said.