The Maryland group found allies around the world to defend their work in places such as Sweden and Norway.
Police say they stopped the group because going into the woods at night constituted suspicious behavior.
The team found that pro-vaccine advertisements on Facebook came from a wider variety of sources than anti-vaccination.
Students are too complacent with gross food. We deserve better health standards.
A patron spilled a drink on the male suspect, who responded by showing a handgun on his waist, a spokesperson said.