The Symphony Six were a group of Canadian musicians under contract to the Toronto Symphony Orchestra (TSO) who were denied entry to the United States for a concert tour in November 1951. Coming at the height of the McCarthy era in the US, the six musicians – Ruth Budd, Dirk Keetbaas, William Kuinka, Abe Mannheim, John Moskalyk, and Steven Staryk – were denied visas on the suspicion of being involved in communist activities. The TSO sent other musicians in their place and completed its tour. The six musicians resumed playing with the orchestra upon its return to Canada.