LONDON (Thomson Reuters Foundation) - A U.S.-based non-governmental organization has become the latest casualty in what campaigners say is a global tightening of restrictions on charitable activity by authoritarian governments, by deciding to close its operations in Russia. The MacArthur Foundation, which has operated in Moscow for more than 20 years - financing higher education, human rights and anti-nuclear proliferation campaigns - said new laws had made it "impossible to continue," by placing the charity on a list of "undesirable" organizations - a criticism it said was baseless. "We are entirely independent of the United States government and receive no...