<p>An ultra-royalist known as &ldquo;K 100 Million&rdquo; (เคร้อยล้าน) attacked Progressive Movement leader and former Future Forward Party leader Thanathorn Juangroongruangkit as he was signing books at the Progressive Movement Foundation&rsquo;s booth at the annual National Book Fair at the Queen Sirikit National Convention Centre on Sunday (23 October).</p>