From NPR:
Venice, Italy, will limit the size of tour groups and take other measures beginning this summer to soften the impact of tourism on the local community.
The new municipal resolution will cap tour groups at 25 people — or roughly half of the passengers on a standard tour bus — and ban loudspeakers that "may cause confusion and disturbance," the city said in a statement.
Set to take effect on June 1, the new rules will apply to both the historic center of Venice as well as the islands of Murano, Burano and Torcello.