Protesters across the country have become more sophisticated in the last six years, says University of Florida assistant professor of political science Michael Heaney.

More than a dozen groups have planned small- and large-scale protests throughout the DNC. Even a group of 60 evangelical churches is planning a "quiet demonstration" throughout the four-day event.

"Our commitment to robust free speech and assembly has never wavered," Mayor John Hickenlooper said.

Read more about the groups and past convention protests by clicking the links below.