http://www.gandgbonds.com - What is an immigration bond? A person who has been detained by the Bureau of Immigration and Customs Enforcement for unlawful residence in the US would have to post an immigration bail bond to gain their freedom. The bond is their ticket to getting out of the immigration detention center until the outcome of the case can be determined. From the perspective of ICE immigration, the bond is their assurance that the person will meet their obligations.