You're exactly right - tainted, because the contract killer's money becomes clean (laundered) at the expense of the rest of the money. Now, as to whether every

You're exactly right - tainted, because the contract killer's money becomes clean (laundered) at the expense of the rest of the money. Now, as to whether everyone who had money in that pool will be found guilty by "Big Bad Government", which I think is what distresses you - the answer is no. There are additional criteria, as the article mentions.