The complaint filed Tuesday by Charles M. Murrell III , 36, in US District Court in Boston seeks to expose Patriot Front, a white nationalist organization , to the same kind of financial penalties imposed on organizers of the 2017 gathering in Charlottesville, advisors for the litigation team said. A Black musician who alleges he was attacked last summer in Boston by masked Patriot Front members armed with shields sued the group Tuesday in federal court, setting up a legal battle that his advisors say was modeled after a successful lawsuit against organizers of the deadly “Unite the Right” rally...