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Iran: Provided significant military and economic support, sent military advisers and fighters from the IRGC, mobilized sectarian fighters against Sunnis, and committed horrific massacres that resulted in the deaths of hundreds of thousands of Syrians across the country.
Even from the early days of the Syrian revolution, Hezbollah actively supported Assad regime and participated both logistically and on the ground, brutally crushing demonstrations across Syria. Their members were deployed to suppress, assault, and detain protestors.
Tal al-Zaatar Massacre (1976), committed by Lebanese militias backed by Hafez al-Assad against one of the largest Palestinian refugee camps in Beirut at the time, which housed 50k-60k people. 7 month siege, 55,000 shells fired over 52 days, massacre of more 3000 people.
30/11/2016, Over 45 people including women and children were killed while they tried to flee the besieged East Aleppo. 
On 17/4/2011, a massacre by Assad regime in the city of Homs claimed the lives of dozens of people. This sparked outrage, and next day, after funeral prayers for those who died, it was decided to stage a sit-in protest at new clock tower which was later known as Freedom Square.