Astrologically, the eruption of the masses (crowds made larger by Jupiter's involvement) relates to the fact that the January 12, 2020 Conjunction of heavyweight planets Saturn and Pluto @22Cap46 will perfect upon China's Jupiter (@22Cap21 on September 21, 1949 2nd house, and 22Cap35 on October 1, 1949 in 12th house--both Communist charts found in Campion's The Book of World Horoscopes charts 60 and 61). Both karmic planets of control are now well within orb of China's Jupiter in Saturn-ruled Capricorn, sign of government, law, and business.
However, more to the point of the current chaos and protests in Hong Kong, today transit Pluto @22Cap32 conjoins China's Jupiter 1949 denoting a period when greater power and influence are sought in the realms of economic expansion and politics, yet exaggerating their importance tends to backfire. Reformist activities (ex: new laws) demand total honesty, and intolerance and fanaticism are distinct possibilities during this karmic time. And transit Saturn to China's Jupiter indicates a time of give-back and/or when a slower return for efforts may be expected. Obviously, Saturnian restrictions may affect Jupiterian freedoms.
Finally, let's add potentials of the midpoint picture formed by Saturn-Pluto = Jupiter: 'trouble with authority; adoption of the austere; staying out of trouble; trying to save what's left' (Solar Arcs, Noel Tyl); and, 'social fanaticism' (The Combination of Stellar Influences, Reinhold Ebertin).
Naturally as a common-gooder, I send my best hopes for favorable outcomes to and for the good people of Hong Kong. May all stay safe.
Horoscopes: Saturn-Pluto Conjunctions 1982 and 2020 (charts set for Washington DC).