The Cold War saw frequent talk linking treason with support for Communist-led causes. The most memorable of these came from Senator Joseph McCarthy, who used rhetoric about the Democrats as guilty of "twenty years of treason". As chosen chair of the Senate Permanent Investigations Subcommittee, McCarthy also investigated various government agencies for Soviet spy rings; however, he acted as a political fact-finder rather than a criminal prosecutor. The Cold War period saw no prosecutions for explicit treason, but there were convictions and even executions for conspiracy to commit espionage on behalf of the Soviet Union, such as in the Julius and Ethel Rosenberg case.