Polish Military Organization of Upper Silesia was created in 1919.
Combat Organization of the Polish Socialist Party was created in 1904.
(If you are talking about the Polish Underground during WWII) Founded by Michal Tokarzewski, the Polish Underground was created the help save the live of Poles and Jews during WW II. Its preserved Polish cultural life and was formed as a secret military organization originally. It attempted countless sabotage missions on Germany and its main goal was to take back Poland when it was under rule by Germany and the Soviet Union.
The Nazis faked a Polish attack on a radio station in Gleiwitz, Upper Silesia.
Combat Organization of the Polish Socialist Party ended in 1911.
The Polish Bride was created in 1998.
Polish International was created in 1975.
Polish Mint was created in 1994.
Polish YMCA was created in 1923.
Polish Brethren was created in 1556.
Polish cochineal was created in 1758.
Polish rubel was created in 1841.
The Polish Review was created in 1956.