[Alouette]

recalling how Martin Luther King, Jr. responded to a student who attacked Zionism: "When people criticize Zionists, they mean Jews. You're talking anti-Semitism."

What she "recalled" is an urban legend. Martin Luther King, although a supporter of Israel, never wrote the "Anti-Zionism=Anti-Semitism" essay attributed to him.

[Peter Porcupine]

Did you read your own link? It says MLK did say that very thing, word-for-word...only not in a letter in the Saturday Review. CAMERA states one can use the sentence as a direct quote from MLK with complete confidence:

This quotation has been confirmed, so you should feel assured that you can use the quotation in letters. Just be sure to mention that it came from Dr. King’s 1968 Harvard University appearance, so that no one will think it is from the debunked “letter.”

[nickcarraway]

The letter in that magazine is an urban legend. But the subtsance of what was said was true:

Martin Luther King, Jr. in a 1968 appearance at Harvard, where he said: “When people criticize Zionists, they mean Jews, You are talking anti-Semitism.” [ from “The Socialism of Fools: The Left, the Jews and Israel” by Seymour Martin Lipset; in Encounter magazine, December 1969, p. 24. ].