The following letter was sent to the MIT community today by President L. Rafael Reif and includes a letter sent to MIT faculty today by Provost Cynthia Barnhart, Chancellor Melissa Nobles, and Chair of the Faculty Lily L. Tsai. To the members of the MIT community, Last fall, I asked the provost, chancellor and chair of the faculty to assemble a special working group to take up the charge of exploring, on behalf of the community, a range of profound questions around freedom of expression and academic freedom – and today I share…