the Islamic brother started protesting against the government and because of the protest members of the brotherhood were either killed or persecuted. the Islamic brothers weren't the only ones in trouble or killed, many people in Syria were having trouble too. like when someone has been captured by the security branch they could be arrested and have no reason on why they are arrested. they could just go to his/her home or workplace and take them. the only way to find them is they would need connections with the security branches or pay bribes. so many people were scared to speak up and take a stand, they usually didn't say anything so they wouldn't risk punishment.