Serious Organised Crime?

BBC NEWS | Politics | Falconer defends new protest law: "Maya Evans, 25, recited the 97 names by the Cenotaph memorial to Britain's war dead in Whitehall, near Downing Street.

She was found guilty of breaking a new law stopping unauthorised protests within half a mile of Parliament.Ms Evans, a vegan cook from Hastings, was given a conditional discharge and ordered to pay £100 costs after being found guilty of breaching the Serious Organised Crime and Police Act 2005."

The idea that we take a measure, which is a public order measure, designed to protect our Parliament building as depriving us of freedom of speech is ridiculously overdone

How does stopping someone speaking protect a building ?