It is known that in the summer of 1944 Ambrazevičius left for Germany, and in 1948 for the United States, where he edited a Catholic daily, Darbininkas, and continued his work in the Supreme Committee for the Liberation of Lithuania in exile. He published a number of leaflets illustrating German and Soviet crimes in Lithuania and the Lithuanian resistance, for example, In the Name of the Lithuanian People (1946) and Appeal to the United Nations on Genocide (1951). In 1964 he published a book Alone, all alone about the Lithuanian armed resistance.
The text details the life of Ambrazevičius, who left Lithuania during World War II for Germany and later moved to the United States where he worked as a journalist and continued his advocacy for Lithuanian liberation. He published pamphlets detailing atrocities committed by both Nazi Germany and the Soviet Union against Lithuania, and wrote a book about the Lithuanian resistance movement.