Kolel L'horaah Ma'asis Crown Heights - Shiur 12 on halachic topics - by Rabbi Shraga Dovid Homnick, Sgan Rosh Kolel, on questions that have cropped up throughout history regarding accepting contributions from disreputable sources, and whether the law of "esnan" applies; donations from a mechalel Shabbos and whether the din of "mumar" applies, and more

https://www.youtube.com/watch?v=BLRgAHmwZjU