Oustside of the area known as colonized space (where most of the political influence out powers mega corporations and other groups) there are no real dirty wars. This place is considered a
no touch zone for most disputes. Even if the Corp Wars or small dirty wars were to reach civilized space there wouldnt be a chance of real open war.
Unlike the fringes of known space the civilized portion of space has more Star Law police officers and government funded civil defense soldiers to stop any sort of conflict from happening or stop it in mid flight. Now if a person was to travel further towards the fringes of known space then the Corporations hold the power along with other "government" sanctioned groups, or even the possiblity of Satharian followers.
Wars are fought amongst the stars of this portion of space. Corporations fight for resources such as planets where they can allow their companies to thrive and produce materials better than the corporations.
Much of the "Private Sector" of known space are involved with these "Dirty Wars" or "Corporate Wars". Many famous private security contractors come out wealthier than they come in. Corporations accept those with previous military experience and use the mercs to hunt down Corporate overseers of opposing corporations. This allows corporations themselves to keep from being "involved" directly with the Corporate disputes and makes it to where if those who get caught they can say they have no such records of those individuals.
Most Star Law officers either bought off or even killed. Political leaders in these areas are either enemies or valuable allies to the Corporations. Many of thopse who choose opposition call for help from the special forces or Star Law officers. Many will answer the call but not many are able to survive as well as say the civilized portions of space. Those who decide to side with the corporations (or even the hundreds of other groups in the area) grabt political immunity for those who work for the groups or corportions.
Even though much of the fringes of known space are controlled by the UPF and are technically under jurisdiction of Star Law. But, with more and more deaths of political officials and officers the Fringes have become the interstellar "no man's-land". This makes it easier for corporations to roam freely as well as other groups. As a citizen of the UPF it is said d any who decide to move towards or to the fringes are no longer sanctioned by the UPF. Unless for some odd reason the UPF military or star law will not negotiate on terms of hostage situations. This makes it easier to keep what little portion of space they have under complete control of the UPF.
Crimes committed in or around the Fringes is considered as a felony or death sentence inside the Frontier. War criminals and such are hunted down and either executed or captured for trial. Inmost cases the UPF will only act if UPF citizens are involved. Meanwhile Star Law may search and secure evidence in the fringes of known space but are known for doing so.