黑基金 means a fund which is illegal, at that time, people thought investing in funds were the best way of investment, much better than putting the money in bank, so some illegal groups take advantage of people's "greed" (黑基金 is said low risk,high profit like 200%), and claim its a good fund, like american MCAN fund, or Swiss Blah Blah...or just in the name of a big fund company without their knowledge to swindle out of their savings, ripping off people. in the end, 血本无归 which means not only didnt people obtain any so called profits, but also their original capital, in a cruel/sad way.
Y的 is kind of defaming people, fool/play around them,look down upon them, in a mega rude way.