anti-communist oath case
... that only six of the U.S. Supreme Court's nine justices participated in a 1950 anti-communist oath case?
... that only six of the <a href="./Supreme_Court_of_the_United_States" id="mwBQ8" rel="mw:WikiLink" title="Supreme Court of the United States">U.S. Supreme Court</a>'s nine justices participated in a 1950 <b id="mwBRA"><a class="mw-redirect" href="./American_Communications_Association_v._Douds" id="mwBRE" rel="mw:WikiLink" title="American Communications Association v. Douds">anti-communist oath case</a></b>?