The Guardian Angels are planning to expand their neighborhood watch efforts into Philadelphia after requests from the public amid unrest and uncertainty surrounding the 2020 presidential election. The non-profit crime prevention network, founded by Curtis Sliwa in New York City in the 1970s, has already deployed 4,000 volunteers to other parts of the nation, such as Washington, D.C., Denver, Portland, Chicago, Tampa, Baltimore and Cleveland, in addition to the Big Apple.