Thousands of supporters of jailed far-right activist Tommy Robinson marched through London on Saturday as anti-racism demonstrators mounted a nearby counter-protest. The so-called Unite the Kingdom march — planned by Robinson and supposed to feature him as speaker — led to calls for his freedom after his arrest Friday on a warrant for contempt of court. “We want Tommy out,” the crowd of mostly white men chanted. The sea of marchers held Union and England flags and some waved “Make America Great” banners as they gathered near a fenced-off statute of former Prime Minister Winston Churchill in th…