<p>| Writing about | people | whose circumstances] | |were deplorable |, Dickens used the novel |to protest | social conditions in Victorian England. No Error</p>
<p>There's no error in this sentence, but I was pretty certain that [to protest] was incorrect. Shouldn't it be [to protest AGAINST] rather than [to protest]? Shouldn't there always be a preposition after "protest" when "protest" is used as a verb?</p>