RABAT, Morocco — In a widespread crackdown, sub-Saharan migrants in Morocco are facing arbitrary arrest, banishment to remote sections of the country and, lately, outright expulsion, analysts and rights advocates say.

Rights advocates contend that the raids, which government officials acknowledge, began in the summer and were coordinated with Spain and the European Union to stem the tide of migrants to the Continent. The Moroccan government says they were aimed at only undocumented migrants and human trafficking.