You are entitled to the truth about where your money goes. Know your charity. Ask questions before giving and ask for answers in writing. Legitimate charities welcome your inquiries. Avoid pressure tactics.
Many charities have similar names.
Some scam artists intentionally use names resembling those of respected groups. Make sure you know which group is really asking for your donation. Be wary of phone calls. Get the name of the person calling and the exact name of the charity. Ask if the caller is a professional fundraiser, and, if so, how much of your donation actually goes to the charity.