Patricia N. Saffran After Mayor Mamdani applies his John Hancock to the City Council bill recently passed banning the carriage horse industry, the TWU immediately will be in Federal court defending the carriage drivers. They’ll ask for an injunction. TWU attorney Arthur Schwartz found Fifth Amendment and State constitution violations. He said, “They can’t take away your property without due process. Sometimes the government can act quickly to try to eliminate a public nuisance, but no one is claiming that the horses are a public nuisance. You can regulate businesses, you can adopt…