American filmmaker Matthew Heineman proved his true grit two years ago with the documentaryCartel Land.
Some have fled in fear for the own lives.
Even in exile, they are in no way safe.

Syrian journalist Abdalaziz Alhamza and director Matthew Heineman.Dia Dipasupil/Getty Images
It will be released in theaters (via Amazon Studios and IFC Films) on July 7.
Oscar-nominee Rosamund Pike (Gone Girl) will star as Colvin, who was killed in Syria in 2012.