As Soviet spy networks were compromised in this period, connection with Soviet intelligence was temporarily ended, but resumed in 1948, when the Rezidentura ascertained that Cohen could be approached. Together with Lona Cohen, they ensured the continued secret connection with a number of the most valuable sources of the Rezidentura. They began working with Col. Rudolph Abel up to 1950, when they secretly left the United States and moved to Lublin, Poland. While in Poland, Morris and Lona engaged in numerous foreign missions for the Soviet Union, traveling to Japan, Hong Kong, Australia, New Zealand, Austria, Belgium, and the Netherlands.