Most of the industry in the Eastern European block was completely unable to even sustain itself (or turn a profit) outside of the captive market of the Warsaw Pact though.

The leftist governments tried to keep some of it above water (with money grants and granted monopolies) in the name of "the jobs" at huge costs to the rest of the economy and tax payers. The resulting corruption and various party mafias are still marring those societies today.

But eventually various private enterprises grew, took over and became the success stories of today.