Angry protesters marched through Hong Kong on Monday against what they described as suppression by Beijing, days after Chinese authorities ruled that part of a city rail station would come under mainland law. Previously on Sunday, Hong Kong leader Carrie Lam Cheng Yuet-ngor broke her silence over mounting criticism by local lawyers of the contentious joint checkpoint plan for the city’s cross-border rail link, hitting out at what she called an “elitist mentality” among those opposing it. The decision to lease part of a new Hong Kong rail terminal to mainland China and to allow Chinese officers to enforce mainland law there has raised concerns the plan would undermine this city’s legal autonomy.