The main "Illegal" messages are the relationships between privilege, power and race. This can be seen in social relations in relation to race, as the story takes place in a universe where white-skinned people have guaranteed citizenship, have power social and economic, the freedom to act as they please, and all the perks that a system can promote. The black population, on the other hand, does not have this citizenship and is devalued, oppressed, exploited and even deported and killed.
"Illegal" presents the story of a society in a fictional country called the Freedom State. Despite the name, the country lives in a system of constant oppression, where the entire society is subject to governmental control, which determines who is legal within the country and those who are illegal and must be fought.