Donald Trump’s revised travel ban takes effect Thursday — it blocks citizens of six (down from seven) predominantly Muslim countries from entering the United States — but the revisions haven’t placated his opponents.

More than 440 so-called social entrepreneurs, including at least 25 nonprofit leaders from the Boston area, have signed an open letter to the president registering “unequivocal disagreement” with his order.

Spearheaded by the Skoll Foundation and published on Medium, the letter says that “diversity is the lifeblood of social, economic, and political progress” and requests that Trump “not deny us the right of welcoming people, regardless of their religion or nationality, to our shores.”

Among the Boston signers are: Molly Baldwin of Roca, Naila Bolus of Jumpstart, Gerald Chertavian of Year Up, Yolanda Coentro of the Institute for Nonprofit Practice, Gregg Croteau of UTEC, Willy Foote of Root Capital, Wendy Foster of Big Brothers Big Sisters of Massachusetts Bay, Bob Giannino of uAspire, and Gary Gottlieb of Partners In Health.

Others on the list include Emily McCann of Citizen Schools, Cassie Scarano of Commongood Careers, Eric Schwarz of the College for Social Innovation, and Matt Segneri of HBS Social Enterprise Initiative. 

— SACHA PFEIFFER, Boston Globe