Keffah is an Alawite, the same sect as President Bashar al-Assad, but she refuses to be identified as that. "I am a Syrian," she says.
She denies that her country is being engulfed by a sectarian war. She says her group delivers aid and reach out to the different communities in an effort to keep Syrian society united against a sectarian rift.
Both Zaidoun and Keffah are opposed to any international military intervention in the conflict. They believe a negotiated end to violence is still possible and want a political process that would turn Syria into a democratic state.
But as the brutal civil war that has claimed nearly 70,000 lives continues with no end in sight , they say the plight of the tens of thousands of detainees is forgotten.
When asked how many people they know who are still detained, Keffah says: "It's a long list. A hundred faces are flashing through my head at this moment."
People are detained at random. Keffah and Rami were detained as they arrived to meet with a contact. Zaidoun was detained at a Damascus café after he showed up for a meeting.
Families of those detained spend weeks and months looking for their missing loved ones, not knowing if they are dead or alive. In some cases they get messages from released detainees.
Keffah says she spent her 18 days in jail trying to memorize the names of the dozens of detainees she said would be brought in every day.
In the facility where Zaidoun was held, he says the ages of detainees ranged from 13 to 75.
Torture is rampant and many they say are forced to confess crimes they did not commit.
In a press release last week, the International Committee of the Red Cross (ICRC) said they have only been able to carry out two prison visits to the central prisons in Damascus and Aleppo since 2011.
"That was good, but it is not enough. Of course, some places of detention are in areas too dangerous for us to enter. But this limited access means that there is no monitoring of the situation of detainees. That would be very worrying in any armed conflict and it is certainly a serious concern in Syria," the ICRC said.
But it is not only the regime that is holding detainees. Rebel fighters in opposition controlled areas have captured their own detainees too. With limited access amid a state of war, it is not clear how many people are detained by the Free Syrian Army and other rebel factions.
Zaidoun and Keffah know far too well the risks associated with speaking out, but they say fear of detention will not stop them.
"Of course I am afraid, but freedom tastes so good. No one, other than those who taste it for the first time, know what that is like. We have started a journey from which there is no turning back," Zaidoun said. "It will be a betrayal for those who lost their lives."
Keffah, whose name means struggle in Arabic, believes she has a duty to the next generation of Syrians.
"I don't want to take anything from this. I want the day to come when another generation has a better life than the one we had," she said.
"To me, my father, his generation and the one before his are all criminals because they were silent. Imagine us staying silent and leaving this for our children."