The ACLU of Georgia reports that it is suing "on behalf of two vegan protesters who were subjected to false imprisonment, false arrest and harassment by officials of the Homeland Security Division of DeKalb County and the DeKalb County Police Department."

It also links to the police detective's report, which seems to me to substantiate the ACLU's charges — harassment and false arrest sounds like the right description, based on the detective's own description of what happened. There might of course be some factual details that would change the analysis, but right now it looks like pretty bad behavior.