Jeremy Slevin and Rebecca Vallas wrote a helpful explainer on TANF after the 20th anniversary of the 1996 “welfare reform” law last year.
The Center on Budget and Policy Priorities has a great explainer on what block granting would mean for SNAP.
Kaiser Health News has their own helpful explainer specifically focused on Medicaid.
For a broader historical (if a little dated) overview of block grants, read the Urban Institute’s 2004 report.