China’s ruling Communist Party has vowed to “resolutely crack down on infiltration and sabotage activities by hostile forces,” following the largest street demonstrations in decades staged by citizens fed up with strict anti-virus restrictions. The statement from the Central Political and Legal Affairs Commission released late Tuesday comes amid a massive show of force by security services to deter a recurrence of the protests that broke out over the weekend in Beijing, Shanghai, Guangzhou and several other cities. While it did not directly address the protests, the statement serves as a reminder of the party’s determination to enforce its rule....