Men are 49.2% of the population yet 93.2% of the prison population are males. Obviously the system is biased against men.
The apparent "bias" is of course due to the fact that the "criminal justice system" is only part of a larger system, and within the larger system, only functions as an arbitrary instrument or weapon to harm or punish men, as
men.
Women are punished and disciplined in other ways of course, but it's a system controlled by powerful men (alpha males) who see less powerful men (beta males) as potential rivals who must be controlled and brought into subordination to "the system."
For all the "beta males" stripped of their rights and privileges, there are similar numbers of women forced to obey their pimps, most of whom are males, of the ruling "alpha male" set.
The "prison system" is an arbitrary tool used mainly by men to punish and control other men; you can call it biased against men if you want to -- there's always some lady or another screaming rape or whatnot -- but it's almost entirely a system of men keeping other men in prison, and women as a class don't have any real authority or say in how it's run.
The bias exists, the numbers are real, of course, but don't think some lady coming to the rescue is going to march into the visitor's center of the federal penitentiary and get her boyfriend out of prison because the system is biased against poorer or less powerful men.