サム・ジアンカーナ
They retired from public appearances in 1968, giving their last performance that year on "The Ed Sullivan Show." Phyllis McGuire continued to perform solo for a time. The demise of the group is often attributed to Phyllis' long-standing personal relationship with mobster Sam Giancana (although for years she claimed that their friendship was strictly platonic), which reportedly led to the group's blacklisting.