Here is a book, The films of Samuel Fuller: If you die, I’ll kill you, written by Lisa Dombrowski talks a lot about Sam Fuller and his films. In Chapter 2: The Fox Years, 1951-1956, the author says:
Park Row is the one film on which Fuller truly operated without oversight, free as he was of studio interest, the pressure of a producer, or the demands of a financier. Fuller’s production freedom during Park Row allowed him to commit his energies where he wanted, and the film reflects both the most anemic and the most exciting techniques within his visual repertoire. Park Row is the film in which Fuller demonstrates his greatest reliance on the long-take master shot, containing an average shot length of thirty-six seconds—well above the Hollywood average of eleven to twelve seconds normative during the period and the longest of Fuller’s career.
Park Row is a visual embodiment of Fuller’s passion for journalism and history and of his excitement at the freedoms afforded by independent production.
Just to elaborate on the mentioning of Sam Fullers love for long shots for scenes. According to “Turner Classic Movies”, Fuller, had a reputation for having his actors shoot very long scenes at once. Furthermore, it was said that; Fuller, sometimes, had the actors in his films: remember up to 10 pages of the script at once, just for one scene.
For more information on Sam Fuller and “Park Row” check out this link … http://www.tcm.com/this-month/article/88939%7C0/Park-Row.html