What is the fine-grained topic of the following text: While the main reason for the Dominican ruling class to start expelling Haitians and Haitian Dominicans appears to be ideological, it is also undoubtedly intended to make the remaining Haitian workers fearful and tentative when it comes to pushing for higher wages and better working conditions. Only return the topic.
Expulsion of Haitians and Haitian Dominicans by Dominican ruling class