Four prominent leaders of Hong Kong’s democracy movement, including two professors were jailed on Wednesday for their role in organising mass protests in 2014 that paralysed the city for months and infuriated Beijing.

The prison terms are the latest hammer blow to city’s beleaguered democracy movement which has seen key figures jailed or banned from standing as legislators since their civil disobedience movement shook the city but failed to win any concessions.

Nine activists were all found guilty earlier in April of at least one charge in a prosecution that deployed rarely used colonial-era public nuisance laws over their participation in the Umbrella Movement protests, which called for free elections for the city’s leader.

Their trial renewed alarm over shrinking freedoms under an assertive China which has rejected demands by Hong Kongers for a greater say in how the financial hub is run.

Two key leaders of the mass protests – sociology professor Chan Kin-man, 60, and law professor Benny Tai, 54 – received the longest sentences of 16 months in jail, sparking tears in court and angry chants from hundreds of supporters gathered outside.

Two other leaders – activist Raphael Wong and lawmaker Shiu Ka-chun – received eight month sentences while the rest either had their jail terms suspended or received a community service order. One defendant, lawmaker Tanya Chan, had her sentencing adjourned because she needs brain surgery.

The jail terms are the steepest yet for anyone involved in the 79-day protest which vividly illustrated the huge anger – particularly among Hong Kong’s youth – over the city’s leadership and direction.

As Wong was led away by guards he proclaimed: “Our determination to fight for democracy will not change.”

Tai and Chan founded a civil disobedience campaign known as “Occupy Central” in 2013 alongside 75-year-old Baptist minister Chu Yiu-ming, who was one of the defendants to have his jail term suspended.

Their original idea of taking to the streets to demand a fairer system and the right to directly elect Hong Kong’s leader was a precursor to the student-led Umbrella Movement a year later that brought parts of the city to a standstill.

As the defendants arrived outside court Wednesday morning they were met by a noisy crowd of supporters shouting “Add Oil!”, a popular Cantonese phrase to signal encouragement.

Others sang “We Shall Overcome”, the gospel song that became an anthem of the civil rights movement in the United States.

“Stay strong and be positive,” a tearful Tanya Chan told the crowd.

Many supporters were holding umbrellas, an emblem of the 2014 protests after they were used by young protesters to defend themselves against police batons, tear gas canisters and pepper spray. (NAN)

•Photo shows Law professor Benny Tai (R) and sociology professor Chan Kin-man (L) among the protesters jailed by Hong Kong authorities

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