They call from different numbers asking for my husband. They hang up.

Never heard of this caller before. Agree with Greg. My late husband fought colon cancer 10 years and he never received a dime from any cancer organization. I'm working on paying off his bills that insurance didn't. Don't give to any org. over the phone!
This one called me @ 7:54p.m.PDT tonight. Left no message.

As B-Edwards said, they are not doing anything illegal.   They are a mega-fundraiser company which knows the law and how far they can go.   Here's a BBB list of groups they collect for:
Type of Entity Sole Proprietorship
Business Category Telemarketing Services
Soliciting Organizations
Alternate Business Names
American Children's Society, Inc
American Police and Sheriffs Association
Association for Homeless and Disabled Veterans
Breast Cancer Research & Support Fund
Community Charity Advancement
Disabled Police and Sheriff Foundation
Dogs for Law Enforcement
Firefighter Support Foundation
International Union of Police
International Union of Police Associations
National Police & Trooper Association
Reserve Police Officers Association
U.S. Firefighters Association
Additional Information
Community Fundraisers is not a charity. It is a professional fundraising firm for various charities. The company is located in Wauwatosa, WI, but will provide fundraising services for charities across the country including: Association for Homeless and Disabled Veterans, Breast Cancer Research & Support Fund, Disabled Police and Sheriff Foundation, Dogs for Law Enforcement, Firefighter Support Foundation, International Union of Police, National Police & Trooper Association, Reserve Police Officers Association and U.S. Firefighters Association. To search for a charity, please visit the BBB Wise Giving Alliance at www.give.org.

ANY charity that does cold-calling has a very high likelihood of being a scammer or at least a very poor choice for your hard-earned cash.  None of the charities I support ever calls me (thank you!), they fund-raise strictly via US mail or my email address, though the American Cancer Society called a couple times, just because I canvassed the neighborhood for them once, as they have a local office that helped me after I had cancer.  I think the good charities that make the best use of their donations do not call willy-nilly.  These companies use sound-alike names too, don't fall for that!

I will never donate to ANYONE who starts their 'sales pitch' with the phrase "just so you know.........."