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People were not only exploited for their work but also kept in a state of slavery , '' Italy 's national anti-Mafia prosecutor , Piero Grasso , told reporters at a news conference on Tuesday in Bari .
 location contains: Italy, Bari
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Italy, Bari 
Answer:
 location contains: Italy, Bari