Blue Police which was an attempt to re-establish pre-war Polish police under German supervision - this is likely what the linked means by drew upon some Polish agencies, such as Polish police forces. The force
consisted primarily of Poles and Polish speaking Ukrainians
the policemen were to report for duty or face the death penalty.
Its main responsibility was to respond to common crimes, although units were are also used to guard entries to Ghettos, training Jewish Ghetto Police (see below) as well as (in later years) for anti-partisan activities.
While Blue Police were never declared a criminal organization in certain cases its members assisted during street roundups, clashes with resistance or cooperated with szmelcowniks. There are several documented cases where members of the Blue Police were forced to carry out executions on both ethnic Poles and Jews.
That being said, a large number of the members participated in the resistance (with actual estimates varying between with different estimates varying between 25 and 30 percent), including Marian Kozielewski - the first commander of the Blue Police.
According to Wikipedia 9 members of the Blue Police have awarded the Righteous Among the Nations: Wacław Nowiński, Bronisław Marchlewicz, Władysław Cieśla, Franciszek Banaś, Piotr Czechoński, Jan Fakler, Jan Kubicki, Stanisław Śliżewski, Władysław Szalek.
At the same time Emanuel Ringelblum wrote in his journal:
The demoralization of the Polish police and Polish secret agents is indescribable. They do nothing in the Ghetto but move about detaining wagons full of merchandise and extorting protection money
On another occasion he wrote
The Polish police didn’t take part in the forced work press gangs
as well as
They are still filming the Ghetto. Every scene is directed. E.g., yesterday they ordered a child to run outside the Ghetto Wall at the corner of Leszno and Zelazna Streets, and to buy potatoes there. A Polish policeman catches the boy and raises his arm to beat him. At that moment who should come along but a German policeman: He grabs the Pole’s arm—children are not to be beaten!
Some historians, like Jan Grabowski, claim that Blue Police actively participated in the persecutions and killings of Jews in Dąbrowa Tarnowska and further notes:
Although our analysis concerns only one county, there is no reason to think that the activities of Polish policemen from Dąbrowa differed from the working habit of their counterparts of the other rural areas of occupied Poland with similar ethnic composition.
For additional perspective you check Patterns of Cooperation, Collaboration and Betrayal: Jews, Germans and Poles in Occupied Poland during World War II linked here by Avery.
Jewish councils (Judenräte) - Jewish organization responsible for administering ghettos, managing forced labor, collecting tributes, and finally preparing deportations.
To ensure compliance Nazis employed Jewish Ordnungspolizei (see below), and not complying consul members were killed on place, or sent to concentration camps. According to Wikipedia, in the Łódź ghetto:
(...) selected 31 public figures to form the Council. However, less than three weeks later, on November 11, twenty of them were executed and the rest disappeared, because he denounced them to the German authorities "for refusing to rubber-stamp (...) policies."
giving unchallenged power to Chaim Rumkowski whose
rule, unlike the leaders of other ghettos, was marked with abuse of his own people coupled with physical liquidation of political opponents. (...) He was known to get rid of those he personally disliked by sending them to the camps. Additionally, he sexually abused vulnerable girls under his charge.
Jewish Ghetto Police were responsible for securing deportations and keeping public order in the ghettos. A majority of members were recruited from pre-War criminals, and were known from extortions, blackmails and other criminal activities.
In the Warsaw Ghetto a so-called Jewish Gestapo also existed, responsible among other things for tracking the black market, as well as
tracking down Jewish people outside the Ghetto walls, as well as their Polish helpers, and often profited by extorting them.
For additional details about Jewish Police please check my answer to Is there any evidence of individual Jews participating in the Holocaust?.