Hundreds of Midtown East residents voiced overwhelming opposition to a plan to build an underground casino next to the United Nations during a heated town hall Thursday evening, with shouts of “blood money” and “not here!” The plan, from the Soloviev Group, would be for a massive entertainment district dubbed “Freedom Plaza” that would include a casino, hotel, shops, open space and over 500 units of affordable housing between 38th and 41st St. beside the FDR Drive. The developers presented the plan at a public meeting hosted by state Sen. Kristen Gonzalez at the NYU College of Dentistry, with …