From Wikipedia it says under the entry for
"African American- Jewish Relations" when you scroll down under it says "Anti-Semitism among African Americans" and it says
"Some leaders of the black community have publicly made anti-Semitic comments, Expressing anti-Semitic opinions that are held by a wider circle of some blacks, Accusing Jews of over-aggressiveness in business relations, Loyalty to Israel (rather than loyalty to the United States), Alleged participation in the slave trade, And economic oppression.  Some analysts attribute black anti-Semitism to resentment or envy "directed at another underdog who has 'made it' in American society". 
In 1935 during the Great Depression, Black activist Sufi Abdul Hamid led boycotts against certain Harlem merchants and establishments (often owned by Jewish proprietors) which he claimed discriminated against blacks. Some Jews accused him of anti-Semitism for these activities. 
In 1984 presidential candidate Jesse Jackson and former United Nations ambassador Andrew Young made anti-Semitic comments, Which were widely publicized. These remarks were thought to have extended the era of African-American and Jewish distrust into the 1980s. 
In 1991 in Brooklyn, A black mob that was involved in the Crown Heights riot killed Yankel Rosenbaum, An Orthodox Jew, After a car that was driven by a Jew hit and killed a black boy in the neighborhood. Some commentators believed that the unrest was related to anti-Semitism. The two ethnic groups live in close proximity to each other in this neighborhood, And the Orthodox Jewish community has been expanding. 
During the 1990s, Anti-Semitism became widespread in black communities on college campuses, Where some made accusations about Jewish participation in the slave trade, With some commentators claiming that they had dominated it.  Prof. Leonard Jeffries of the City College of New York was a proponent of this idea, But his conclusions have been disputed by major African-American historians of the slave trade, Including David Brion Davis.
According to surveys that were begun in 1964 by the Anti-Defamation League, A Jewish organization, African Americans are significantly more likely to hold antisemitic beliefs than white Americans are. There is a strong correlation between higher education levels and the rejection of anti-Semitic stereotypes among members of all races. Black Americans of all educational levels are significantly more likely to be anti-Semitic than whites with the same educational level. 
In the 1998 survey, Blacks (34%) were nearly four times as likely as whites (9%) to have answers that identified them as belonging in the most anti-Semitic category (those agreeing with at least 6 out of 11 statements that were potentially or clearly antisemitic). Among blacks with no college education, 43% responded as the most anti-Semitic group (vs. 18% for the general population). This percentage fell to 27% among blacks with some college education, And 18% among blacks with a four-year college degree (vs. 5% for the general population).  "
Notice you Never, Never see Jews attacking Black People, It's Blacks who attack innocent Jews, Let's be clear, Most Blacks are decent people, But in these incidents, It's always the blacks fault