Across Indianapolis, roughly three dozen groups of good Samaritans bring food and clothing and other amenities to the city's neediest, the hardcore homeless who live on the streets even in the bitterest cold. [...] with freezing temperatures and up to 5 inches of snow in the forecast, advocates for the homeless have a request for these good Samaritans: Shelter-resistant, often mentally ill and with drug or alcohol problems, they sleep outdoors even on the coldest nights, often huddled in camps under bridges.