Building samples of distant cluster galaxies with ALMA

Beyond z>1.5, galaxies in and near galaxy clusters are more actively forming stars than their local counterparts, most likely due to higher gas fractions at these earlier epochs. ALMA is and will be instrumental in quantifying this by measuring dust and molecular gas masses of these high-redshift sources. Results from successful ALMA programs targeting distant galaxy clusters show that there is indeed evidence for differences with local cluster galaxies, which will be highlighted. What is lacking is a large enough statistical sample of such sources, either from targeting specific areas of various clusters, or mapping out a whole cluster up to several times its virial radius and beyond. Strategies for obtaining such large samples of distant cluster galaxies are discussed, with the aim of probing a range of environments. Such strategies include exploitation of the growing ALMA archive.