Sentence:  “[...] Churchill, my dear fellow, we have such greedy <WSD>sharks</WSD>, and wolves in lamb's clothing. Oh, dear, there's so much to tell you, so many warnings to give you, but all that must be postponed for the moment.” 
Meaning of the word marked with <WSD> tags:  Someone who exploits others, for example by trickery, lies, usury, extortion.