But no trial. I take that to be the key element in any American denial of justice, as under McCarthy.
Trials are only relevant to determining whether a government can forcibly take away a person's property or their basic human liberties, like control over their movement own body that prison inherently entails.
Trials and their outcomes have little relevance to how private citizens should treat other people. That is because trial outcomes only have a modest relation to whether a person broke laws, and the law has very minimal relation to whether a person acted unethically.
In government run trials, principles of procedural fairness must be upheld for the longterm sake of a fair, just, and free society. Sometimes those procedural rules mean that a guilty person goes unpunished. On the flipside, biases and failures of reason of judges and juries sometimes means that the innocent get punished. That makes the outcome of any trial merely one piece of information that a rational person should use to decide what a persons actions were and whether they are immoral and deserve repudiation. Sometimes the wealth of other information is so overwhelming that it is implausible that a trial outcome would notably alter that conclusion.
Also, the bar of certainty will depend on whether one is going to react in a way that harms the person vs. merely stop acting in a way that helps them. Firing someone is the latter and no one is obligated to help another continue to make millions, so it is reasonable to set the bar of certainty very low and stop helping that person the moment there is sound suspicion.
Note that this does
NOT apply to any arm of government (from courts to any government agency or school) firing or dismissing or refusing help to citizens. For that they must keep the bar at beyond reasonable doubt determined by formal courtroom like procedures. This is because, unlike private citizens, the government does only exist at the expense of the people and in order to help people, including all the accused. Thus any decision for it to not help a specific person is essentially a harm to that person and as an action of government must be kept in check by high standards of evidence to protect the long term principles that govern the justice system.