Chicago Police Round Up 'Friday Night' Gang incidents of officer offiofficer Chicago. -(U.P)- Today was Friday, but if the "Friday night gang", gets together it will be only to reminisce. Police rounded up the "Friday night gang" yesterday. They said the seven-member gang had taken at least $25,000 cash and an untold amount in valuables in 25 tavern robberies during the past year. The members said they got together and did their work each Friday night.