nuclear espionage
...that many cases of nuclear espionage are thought to have occurred since the Manhattan Project?
...that many cases of <b id="mwBD4"><a href="./Nuclear_espionage" id="mwBD8" rel="mw:WikiLink" title="Nuclear espionage">nuclear espionage</a></b> are thought to have occurred since the <a href="./Manhattan_Project" id="mwBEA" rel="mw:WikiLink" title="Manhattan Project">Manhattan Project</a>?