They called my husband cellphone demanding money for Tax evasion Why? They said We owe money to the IRS, There is no such a thing made calls by an important branch operated by the GOV. If you had a call like this reported to the IRS. They have to act before these crooks attack on the vulnerable made believe that owe money that don't owe, lying is their business, Swindlers, Enough.

There is a widespread IRS or "tax scam" being  practiced by scammers on both Canadian and USA residents.
USA tax payers should read this:
http://www.irs.gov/uac/Newsroom/IRS-Reiterate ... -Telephone-Scam

Short answer:
The IRS never initiates a contact via phone.
They always send a snailmail first.

Educational post:
This scam is also described as scam #11, here:
http://phonehelp.2truth.com/facts_rev.html

If you were contacted by an IRS impostor, you may file a report, after clicking on this link:
http://www.treasury.gov/tigta/contact_report_scam.shtml