There are tensions/fights all the time, but the last real war was probably the San Luca feud. After the Duisburg massacre in 2007 it has been pretty quiet, however their presence has almost quadrupled in Germany over the past decade.
I saw a doc about that feud. Very gruesome.
Speaking of that.
'Ndrangheta, massacre of Duisburg: confirmed life imprisonment for Sebastiano Nirta