Why do Zionists in Israel call African immigrants?

"Many people — including mainstream politicians — use the Hebrew word for “infiltrators” to refer to refugees and asylum seekers. In May 2012 recently re-elected Prime Minister Benjamin Netanyahu called them “a threat to the social fabric of our society, our national security, our national identity … and … our existence as a Jewish and democratic state.” A parliamentarian called them “a cancer in our body.” It's not only refugees that have faced discrimination in Israeli society. This week a protest of thousands of Ethiopian Israelis against police brutality was met with...police brutality."