The Supreme Court ruled on Friday that federal prosecutors had improperly used an obstruction law to prosecute some members of the pro-Trump mob that stormed the Capitol on Jan. 6, 2021. The ruling could affect the prosecutions of hundreds of rioters out of the more than 1,400 who have been charged with an array of offenses for taking part in the effort to block certification of the 2020 election results. It could also have an effect on part of the federal case against former President...