The Kadets were liberals. And of these groups, only the Bolsheviks were truly dangerous. The problem with the others is that they destabilized the regime to a point that a Bolshevik takeover was possible - including the Kadets, which refused to condemn acts of terrorism by the SRs.
Were they not allied with Germany in the beginning?
They were allied before the war, then Hitler turned around and attacked them with the weapons that they had helped him build in operation Barbarossa
The Kadets were liberals. And of these groups, only the Bolsheviks were truly dangerous. The problem with the others is that they destabilized the regime to a point that a Bolshevik takeover was possible - including the Kadets, which refused to condemn acts of terrorism by the SRs.