To The Editor: A pretty good rule of thumb for judging media comment on Joe McCarthy is that people who most vociferously deplore him seldom know the facts of record. Vide the recent Dorothy Rabinowitz piece in the Journal attacking Ann Coulter’s new book Treason and its McCarthy chapters. In her double-barreled blast against McCarthy/Coulter, Ms. Rabinowitz makes statements that indicate extensive ignorance of McCarthy’s doings and can but compound prevailing myths about him. One need go no further to see the point than the first of the McCarthy cases Rabinowitz refers to, and that Coulter discusses in her book:...