Why did Frank Sinatra blacklist Tommy sands?

Frank Sinatra reportedly blacklisted Tommy Sands due to a personal and professional rivalry stemming from Sands' relationship with Nancy Sinatra, Frank's daughter. Sinatra disapproved of Sands, feeling that he was not suitable for his daughter. Additionally, Sands' rising popularity in the music industry may have contributed to Sinatra's desire to distance himself from him. This rivalry reflected Sinatra's protective nature over his family and his competitive spirit in the entertainment world.