Sentence:  For three years , since the liquor territorial <WSD>conference</WSD> , Torrio had , with his elastic patience , and because he knew that retaliation could cause only violent warfare and disaster to business , tolerated O ' Banion 's impudent double-crossing . 
Meaning of the word marked with <WSD> tags:  a prearranged meeting for consultation or exchange of information or discussion (especially one with a formal agenda)