CHICAGO (Reuters) - Police in the United States killed at least 1,152 people in the United States this year through Dec. 15, with the 60 largest police departments disproportionately killing black people, according to data compiled by activists who run the Mapping Police Violence project....Forty percent of people killed by police in the country's 60 biggest police departments were black, while the African-American population in those jurisdictions was 20 percent, the report said.