The commander of Hitler's SS bodyguard unit a full blooded Polish Slav named Erich Kempka
http://www.dailymail.co.uk/news/article-1245511/I-Hitlers-chauffeur--I-bunker-hurl-flaming-rag-petrol-soaked-corpse.html
 
There were over 200,000 ethnic Polish Slavs that fought on the German side in World War 2 see:
http://en.wikipedia.org/wiki/Poles_in_the_Wehrmacht
 
Donald Tusk, the Prime Minister of Poland, his grandfather also fought in the 3rd Reich German military in WW2:
http://en.wikipedia.org/wiki/Donald_Tusk
 
In the early years of the war there was the Goralenvolk Polish Waffen SS and in the last few years of the war there was a Polish Waffen SS unit that was so elite and so secret (because it operated behind Russian enemy lines) that it was not even listed in the official German order of battle:
http://en.wikipedia.org/wiki/Polnische_Wehrmacht_%28World_War_II%29
 
In one part of Mein Kampf Hitler says the Russians are a "great people":
"Russia furnishes the most terrible example of such a slavery. In that country the Jew killed or starved thirty millions of the people, in a bout of savage fanaticism and partly by the employment of inhuman torture. And he did this so that a gang of Jewish literati and financial bandits should dominate over a great people. "
 
The 14th Waffen SS Grenadier Division had not only Ukrainian Slavs in it but also Czech Slavs and Slovakian Slavs:
 
http://en.wikipedia.org/wiki/14th_Waffen_Grenadier_Division_of_the_SS_%281st_Ukrainian%29
 
There were 6,000 Slovenian slavs in the 24th Waffen SS Division:
http://en.wikipedia.org/wiki/24th_Waffen_Mountain_Division_of_the_SS
 
General Helmuth von Pannwitz XV SS Cossack Cavalry Corps which had 30,000 Slavs in it:
http://en.wikipedia.org/wiki/XV_SS_Cossack_Cavalry_Corps
 
The 30th Waffen SS Grenadier Division was Belarus Slavs and Russian Slavs:
http://en.wikipedia.org/wiki/30th_Waffen_Grenadier_Division_of_the_SS