Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.

Example input: Passage: Martin Luther married Katharina von Bora, one of 12 nuns he had helped escape from the Nimbschen Cistercian convent in April 1523, when he arranged for them to be smuggled out in herring barrels. Suddenly, and while I was occupied with far different thoughts, he wrote to Wenceslaus Link, “the Lord has plunged me into marriage. At the time of their marriage, Katharina was 26 years old and Luther was 41 years old. Question: In a letter who did Luther credit for his union with Katharina?
Example output: the Lord
Example explanation: The paragraph clearly states that, Luther has credited the Lord for his union with Katharina, hence the Lord is correct answer.
Q: Passage: During the divestment from South Africa movement in the late 1980s, student activists erected a symbolic 'shantytown' on Harvard Yard and blockaded a speech given by South African Vice Consul Duke Kent-Brown. The Harvard Management Company repeatedly refused to divest, stating that 'operating expenses must not be subject to financially unrealistic strictures or carping by the unsophisticated or by special interest groups.' However, the university did eventually reduce its South African holdings by $230 million (out of $400 million) in response to the pressure. Question: What South African Vice Consul did Harvard students blockade the speech of?
A:
Duke Kent-Brown