A Muslim scholar previously denied a visa and barred from speaking engagements in the United States is scheduled to speak at Harvard Law School.
Adam Habib of the University of Johannesburg in South Africa is slated to speak Wednesday about ideological exclusion in an event co-sponsored by the ACLU of Massachusetts.
In January, Secretary of State Hillary Clinton signed orders enabling the re-entry of Habib and Tariq Ramadan of Oxford University in England.
The order was signed after American rights groups filed lawsuits on their behalf challenging the scholars' exclusion into the U.S.
Habib has been a vocal critic of the war in Iraq and some U.S. terrorism-related policies.
The State Department previously said Habib was barred because he has "engaged in terrorist activities."