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Helping Long Islanders when they need it most Find Help Now Family Service League FSL is a social service agency that provides support and security to our Long Island neighbors who need it most. From children and families to individuals and seniors we empower more than 60000 of our communitys most vulnerable to mobilize their strengths and improve their quality of life. Did You Know that in the Past Year . FSL secured permanent housing for 199adults and 116 families.