I avoid the high street because of the charity muggers there.
charity mugger
idiomA person employed by a charity, or by an intermediary fundraising agency employed by the charity, who stands in the street and invites passersby to set up standing orders or direct debits to make regular donations to the charity.
A charity mugger stopped me outside the station and asked if I cared about saving the oceans.
She had grown adept at spotting the bright vests of charity muggers from a distance, weaving through crowds with practiced evasion.