Ohio has loose open carry laws, that some groups look to exploit.
"Now you've got Westboro Baptist in the mix, the KKK and David Duke, you've got anarchist groups showing up, Black Panthers, Black Lives Matter, communist groups showing up – you're talking about, for lack of better words, 'The Purge' here," Tim Selaty, director of operations for Citizens for Trump, a coalition representing other groups including bikers and truckers, told US News and World Report.
However, only Secret Service and authorized law enforcement personnel will be allowed to carry guns inside the event at the Quicken Loans Arena.
Other items specifically banned include containers of bodily fluids, gas masks and umbrellas with metal tips.
The 3.5-square mile event zone in Cleveland was reduced to 1.7 square miles, which makes a number of parks now available to groups for rallies.
The ban is not unlike other conventions. In 2012, water guns were also banned from the streets surrounding the Republican National Convention in Tampa, Florida. However, handguns were allowed.