E.g. John Mackie. Again, the denial that there are any such ethical properties. I'm wary of putting Mackie here since he did think that people can act rightly and wrongly. Strict denial that there are any ethical properties. There's just a nonethical world which we have attitudes, desires, emotions towards.
Ethical judgements are expressions of such attitudes, etc.
E.g.s A. J. Ayer, C. L. Stevenson, Simon Blackburn, Allan Gibbard. There are ethical properties which we can cognize. But, ethical properties are mind-dependent. E.g. John McDowell, Jonathan Dancy, David McNaughton, David Wiggins. Ext.s believe that one can be justified in believing something even if one does not have access to why one is justified in believing it.