Quote attributed (by Joe Salerno) to the late, great Austrian economist Sudha Shenoy (1943-2008), as her closing comment to a session at the 1974 South Royalton Conference (“the first conference on Austrian economics held in North America,” according to Salerno).
Update: to clarify, for anyone who might misconstrue the quote: I do not think Shenoy literally meant people who profess socialistic views should be killed, and I certainly do not believe that. I take the statement as expressing outrage at the systems and beliefs that have killed and ruined hundreds of millions of human lives (see, e.g., Rummel’s “Democide” site and Erik Von Kuehnelt-Leddihin’s Leftism Revisited: From De Sade and Marx to Hitler and Pol Pot).