"When did blacks in this country turn towards socialism?"
When they discovered it was easier to be given their basic needs than to actually work for them.
Or when they tried to work for them and found their path blocked by Jim Crow and legal discrimination.
I don't say this because I'm in favor of socialism, but I can understand how some people, their efforts thwarted at every turn just because of skin color, could feel that the government owed them something. In my family alone there are people who didn't do what they wanted to do in life because of discrimination (couldn't get in a union, couldn't get in a school, couldn't be hired even after obtaining the proper training, etc.) Of course, they did work and contribute to society, but their lives would have been much different w/o de facto and de jure discrimination.
That said, those are all older folks in their 70s. There's no reason for some young black person to stand around expecting government support.