Group 1 - The core viewpoint of the news highlights the effectiveness of Nanjing's summer public security crackdown campaign, known as the "Hundred Days Action," which aims to enhance public safety and combat crime [1][2]. - The campaign has led to the swift recovery of stolen cash, with police returning 2,600 yuan to a victim within six hours of the report [1]. - A criminal gang involved in the illegal sale of blood donation certificates was dismantled, with 370 certificates sold and over 100,000 yuan in illegal profits made within five months [2]. Group 2 - The police have successfully arrested seven suspects linked to the blood donation certificate scam and seized over 200 certificates during the operation [2]. - In response to ticket scalping issues, Nanjing police targeted "yellow cow" operations, resulting in the dismantling of two gangs and the arrest of 25 individuals [2]. - A large-scale security operation was conducted on July 4 and 5, mobilizing over 23,000 police personnel and 20,000 community defense forces across the city [2]. Group 3 - Nanjing police have established 2,300 safety observation points and implemented various patrol methods, including vehicle, foot, and drone surveillance, to enhance public safety [3]. - The focus of patrols includes popular night-time tourist spots and areas with vibrant night economies, extending patrol hours into the late night [3]. - Comprehensive inspections and rectifications are being conducted in industries with new business models to eliminate security risks [3].