Three young Hong Kong dissidents including Joshua Wong were remanded into custody yesterday after pleading guilty to inciting a rally during last year's pro-democracy protests, deepening the crackdown against Beijing's critics. Hong Kong was convulsed by seven straight months of huge and often violent democracy rallies last year in which millions took to the streets. Beijing has refused demands for free elections and authorities have pursued democracy supporters with criminal cases and a sweeping new national security law.  Wong, 24, was prosecuted alongside fellow activists Ivan Lam and Agnes Chow over a protest which took place last summer outside the city police headquarters.