"At the 10th Extraordinary Summit of the African Union, which took place last week, Algeria, along with Mauritania, Tunisia, Libya, Egypt and a number of other countries refused to sign the protocol on the freedom of movement of people and right of residence attached to the African Union’s African Continental Free Trade Area agreement. Reportedly this is due to fears of mass migration to North Africa from sub-Saharan Africa"
"Algeria has repatriated 27,000 sub-Saharan African migrants since 2015, a rare official statistic revealed by the interior minister Nouredine Bedoui last Thursday. He added that repatriations are still ongoing. Algeria is a key destination and transit country for many African migrants, mostly from Mali, Niger, Burkina Faso or Chad. People who have been deported from Algeria earlier this month, stated they were detained in makeshift camps for a few days before being taken on trucks and sent across the border at gunpoint. They then had to walk through the desert for hours to reach In Khalil, the first town in Mali."

Some may be economic migrants, others escaping from the resulting instability of Islamic terrorist groups. Nothing to do with colonialism, more to do with the onslaught of US hegemony encouraging the growth of Islamic terrorist groups especially ISIS. Isis arouse from the instability in Iraq in 2004 and was an offshoot of Al Quaeda.