C^*-algebras associated to directed graphs of groups, and models of Kirchberg algebras

We introduce C^*-algebras associated to directed graphs of groups. In particular, we associate a combinatorial C^*-algebra to each row-finite directed graph of groups with no sources, and show that this C^*-algebra is Morita equivalent to the crossed product coming from the corresponding group action on the boundary of a directed tree. Finally, we show that these C^*-algebras (and their Morita equivalent crossed products) contain the class of stable UCT Kirchberg algebras.