Walmart and a book distributor distanced themselves from Tavis Smiley on Thursday after PBS said an investigation found “troubling allegations” of sexual misconduct by the radio and TV host. The moves came a day after PBS said it was suspending Smiley following an independent investigation by a law firm. PBS said the firm uncovered “multiple, credible allegations of conduct that is inconsistent with the values and standards of PBS.” His show’s page at PBS was scrubbed on Thursday. Smiley has denied any wrongdoing. Walmart, which had been a sponsor of Smiley’s talk show and an upcoming touring theatrical show, cut...