The WW2 was a conflict of ideologies. But it was also a conflict of nations. Sometimes, the ideology of the soldiers didn't fit well to their nations.
In the Red Army, there were high officers who were low officers in the tsar's army in the WW1.
In the Wehrmacht, we can imagine that there were some conscripted KPD voters. In November 1932, the KPD had 5,980,614 votes. Of course, the most active communists were arrested and executed since 1933. But of course this situation didn't happen to the almost 6M KPD voters. Some KPD voters who were 18 in 1932 were 27 in 1941 and could have been drafted to the Wehrmacht.
Generally there were considerable defections from German communists all across the war in the Eastern Front. Low given many dodged the draft and were avoided being conscripted.
The remnants of the White Army however broke to the Germans, famously in the case of the Vlasov battalion, however given the extermination sentiment of the Germans many on-the-fence such as Tuchakevesky could not defect.
