From the longer English Wikipedia page [1] which has a list of his writings.

Dr. Béla Király (14 April 1912 – 4 July 2009) was a Hungarian army officer before, during, and after World War II. The Stalinists imprisoned him. After his release, he commanded the National Guard during the 1956 Hungarian Revolution. He was an academic historian in the United States. He returned to Hungary and was elected a member of Parliament of Hungary.

In 1951, the Mátyás Rákosi regime arrested him on charges of subversion, sedition and espionage. He was sentenced (January 15, 1952) to death by hanging. He spent years on death row. His wife had been detained by the ÁVH (State Security Authority; the political police) from August 1951 to August 1953. She divorced him in 1955. Then he learned his sentence had been commuted to life imprisonment at hard labor. In September 1956 the government paroled him and other political prisoners, a measure intended to soften public unrest.

The Hungarian Revolution of 1956 began shortly after his release from prison. He was weak and ill recovering from surgery, but escaped from the hospital to accept appointment as commander-in-chief of the military guard and military commander of Budapest.

He recognized his forces had no hope of victory over the Soviet army, but resented then Soviet ambassador Yuri Andropov's chicanery in concealing the imminent invasion. After the Soviet military intervention in Hungary, he fled to Austria and later the United States to avoid yet another death sentence, one unlikely to be commuted. He was, in fact, sentenced to death in absentia.

He earned graduate degrees at Columbia University. From 1964 he taught Military History at Brooklyn College, and became chairman of the history department. He retired as Professor Emeritus in 1982.

The Hungarian Wikipedia page is [2].