Interstate united corporation Law enforcement agencies in Colorado. and elsewhere launch investigation into possible corruption and organized crime activity. RM Journal F 22, 1978 sec. 1 p.1, 6 Summary of Denver police's handling of vending firm investigation last year. Post F 15, 1980 p.1, 18 Stanley N. "Sonny" Singer, former head of Interstate United, Corp. in Colo. resigns after investigation of funds misuse. RMN Jy 4, 1980 p.5