used thousands of Polish laborers
... that Nazi Germany used thousands of Polish laborers to build infrastructure for their invasion of the Soviet Union?
... that <a href="./Nazi_Germany" id="mwGJI" rel="mw:WikiLink" title="Nazi Germany">Nazi Germany</a> <b id="mwGJM"><a href="./Baudienst" id="mwGJQ" rel="mw:WikiLink" title="Baudienst">used thousands of Polish laborers</a></b> to build infrastructure for their <a href="./Operation_Barbarossa" id="mwGJU" rel="mw:WikiLink" title="Operation Barbarossa">invasion of the Soviet Union</a>?