Soviet Partisan groups had immense capabilities as the war progressed. Part of the reason for the success of 'Bagration' can be laid with the humble partisan. Not too mention the countless airborne operations undertaken by the Soviets to supply them and also drop scouts and other army specialists.

Incidently, the anti-Soviet partisans were just as resourceful and even longer lived... Estonian and Lithuanian partisans fought the Red Army till the '50s, despite the Soviets deploying armoured forces against them. I have one account that talks of an attack by a WW2 Anti-Soviet partisan group as late as 1976...

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"Watch that Fu*ker, he'll 'ave someones eye out!" King Harold at Hastings 1066.