WASHINGTON — Conservative mega-donor Harlan Crow purchased three properties belonging to Supreme Court Justice Clarence Thomas and his family in a transaction worth more than $100,000 that Thomas never reported, according to the non-profit investigative journalism organization ProPublica.The 2014 real estate deal shines a new light on Thomas’s decades-long relationship with Crow, a real estate magnate and longtime financier for conservative causes. That relationship and the material benefits received by Thomas …