The Polish government has recalled several ambassadors identified in a recent report as having worked for a national intelligence agency accused of having close ties with Russia.
Diplomats to Austria, China, Turkey, and Kuwait have been ordered back to Warsaw.
All were named in a new report on the former Military Intelligence Service, which was disbanded last year. Critics have said the agency maintained links with Russian authorities well after the fall of Communism in 1989.
President Lech Kaczynski and his twin brother, Prime Minister Jaroslaw Kaczynski, have vowed to root out those in public life with close ties to the communist apparatus.
They have claimed former Russian spies in the Military Intelligence Service have tried to control politics in Poland, but critics of the government say the 400-page report fails to back up those claims.
Some information for this report was provided by AFP and Reuters.