I never heard of this either but here's my 2 cents about the topic, about the construction the only logical way of this happening is the Italians extorting Albanian owned construction companies which there are plenty of them around Germany but I doubt the Calabrians have any power to extort around Germany, the other logical explanation is different Albanian and Calabrese construction companies going at it over who gets state tenders contrats. About the drug rackets I don't see how they could be at war knowing the good relations the Albanians have had over the years with the Calabrians even with both of the two groups being big players into drug trafficking in Germany, the Albanians also have a big street presence into Germany along with different groups like the Turks, Arabs, Gypsies which the Italians lack, so it doesn't make sense of the two being at war over the lucrative drug rackets in Germany.