Ecologist and journalist Alexander Nikitin, who worked with the Bellona Foundation, was likewise accused of espionage. He published material exposing hazards posed by the Russian Navy's nuclear fleet. He was acquitted in 1999 after spending several years in prison (his case was sent for re-investigation 13 times while he remained in prison). Other cases of prosecution are the cases of investigative journalist and ecologist Grigory Pasko, sentenced to three years' imprisonment and later released under a general amnesty, Vladimir Petrenko who described dangers posed by military chemical warfare stockpiles and was held in pretrial confinement for seven months, and Nikolay Shchur, chairman of the Snezhinskiy Ecological Fund who was held in pretrial confinement for six months.