Were John Wain and Ödön von Horváth both novelists?
yes
Title: Ödön von Horváth
Passage: Edmund Josef von Horváth (9 December 1901 Sušak, Rijeka, then in Austria–Hungary, now in Croatia – 1 June 1938 Paris) was a German-writing Austro-Hungarian-born playwright and novelist.  He preferred the Hungarian version of his first name and published as Ödön von Horváth.
Title: The Movement (literature)
Passage: The Movement was a term coined in 1954 by J. D. Scott, literary editor of "The Spectator", to describe a group of writers including Philip Larkin, Kingsley Amis, Donald Davie, D. J. Enright, John Wain, Elizabeth Jennings, Thom Gunn and Robert Conquest.  The Movement was essentially English in character as poets from other parts of the United Kingdom of Great Britain and Northern Ireland were not involved.
Title: John Wain
Passage: John Barrington Wain CBE (14 March 1925 – 24 May 1994) was an English poet, novelist, and critic, associated with the literary group "The Movement".  For most of his life, Wain worked as a freelance journalist and author, writing and reviewing for newspapers and the radio.
John Wain Ödön von Horváth