I am a U.S citizen,I got married in U.S.A., my oldest son was born there,and I have 2 more sons that were born abroad and are citizens too, my husband had a green card, but he had drug trafficking problems almost 15 years ago, something like conspiracy, thats why we are living outside the U.S., if we want to go back, can something be done about this so the whole family can live there again? Can he get like a pardon and get a green card again, or there is no way this can be done?

Because you are a US Citizen, there could be waivers available for offenses committed by spouse. You may want to check first with the US consulate in the country where you are living.