A group of actors led by former SAG president Ed Asner has accused the leadership of SAG-AFTRA of a laundry list of financial misdeeds – allegations the union vehemently denies. The allegations are contained in a 10-page letter that was sent to SAG-AFTRA president Gabrielle Carteris, to national executive director David White, and to the national board on the eve of this weekend's board meeting – and just weeks before the union begins negotiations for a new film and TV…