Authorities in Shanghai have implemented a significant crackdown on Halloween celebrations, with police actively detaining revellers in costumes. The crackdown comes amid concerns over political satire, leading to heightened police presence in the streets to prevent rowdy gatherings. Officers are targeting individuals wearing Halloween costumes, reflecting a broader initiative to control public festivities and discourage any actions deemed disrespectful to the authorities. The enforcement aims to put a stop to what officials view as potentially disruptive celebrations during the spooky season.