Call a spade a spade has been used in literary works by what British playwright, novelist, and short story writer who was reportedly the highest-paid author during the 1930s?
Call a spade a spade:  The idiom has appeared in many literary and popular works, including those of Oscar Wilde, Charles Dickens, W. Somerset Maugham, and Jonathan Swift. W. Somerset Maugham: William Somerset Maugham CH ( ; 25 January 1874 – 16 December 1965), better known as W. Somerset Maugham, was a British playwright, novelist and short story writer. W. Somerset Maugham:  He was among the most popular writers of his era and reputedly the highest-paid author during the 1930s.
William Somerset Maugham