Harold Leonard Block was an American comedy writer, comedian, producer, songwriter and television personality. Although Block was a highly successful comedy writer for over 15 years, today he is most often remembered as an original panelist of the television game show What's My Line? who was fired from the show in its third season, reportedly for inappropriate on-air behavior. Block is a controversial figure in the history of television, denounced by some, while praised by others as a writer and for contributing to the original success of What's My Line?.