These are organizations that call (as they say) on "behalf" of police departments soliciting money from you. Fact is no police department has endorsed them to do this. They collect money in the name of perhaps the "Alabama State Troopers"...maybe keep 90 cents out of every dollar....then give the rest to the State Troopers. It's a money making thing but not for the Police. Because they give money to the Police...no matter how much...according to them they are doing what they say they are doing.
Tell them to send you some information and ask what Police Department they represent.