Marx Brothers of "The Big Store" the team announced they were retiring from the screen. Four years later, however, Chico persuaded his brothers to make two additional films, "A Night in Casablanca" (1946) and "Love Happy" (1949), to alleviate his severe gambling debts. Both pictures were released by United Artists. From the 1940s onward Chico and Harpo appeared separately and together in nightclubs and casinos. Chico fronted a big band, the Chico Marx Orchestra (with 17-year-old Mel Tormé as a vocalist). Groucho made several radio appearances during the 1940s and starred in "You Bet Your Life", which ran from 1947 to 1961
Biographies of Karl Marx (1925), Japanese (1930), Spanish (1932), and English (1935). Marx: Man and Fighter is a biography by Boris Nicolaievsky, first published in German in 1933. It was translated into English by Otto Mänchen-Helfen and published in 1936. Some subsequent English editions restore the notes, appendices, and bibliography omitted from the first English edition. Karl Marx: His Life and Environment is a 1939 biography of Karl Marx by Isaiah Berlin, in which Berlin argues that Marx's system of thought depends upon indefensible metaphysical presuppositions. Karl Marx: His Life and Thought is a 1973 biography of Karl Marx by political scientist David McLellan.