Floral tributes to Alexei Navalny, President Vladimir Putin’s fiercest foe who died Friday in a Russian penal colony, were removed overnight by groups of unidentified people while police watched, videos on Russian social media show. More than 100 people were detained in eight cities across Russia after they came to lay flowers in memory of Navalny, according to OVD-Info, a group that monitors political repression in Russia.