They were all killed leaving no survivors
WHO WOULD ACTUALLY WANT TO DO THIS. THIS IS COMPLETELY UNECCESAYR
They were afraid of large numbers of Jews coming in from (in the case of the St. Louis) Germany. 900 people is a lot of people but it would only be the tip of the iceberg if people were allowed to cross the Atlantic and go into the United States. There was a quota of how many people could come in and the US wanted to keep to the quota system.
The United States (at the time of the St. Louis sailing) was neutral, so they also didn't want to endanger that neutrality.
The Civil Rights Movement is an umbrella term for the many varieties of activism that sought to secure full political, social, and economic rights for African Americans in the period from 1946 to 1968.
Civil rights activism involved a diversity of approaches, from bringing lawsuits in court, to lobbying the federal government, to mass direct action, to black power.
The efforts of civil rights activists resulted in many substantial victories, but also met with the fierce opposition of white supremacists