Polish police were criticised by opposition politicians on Saturday for detaining anti-fascist protestors at a nationalist rally, while not reacting to the illegal use of Nazi symbols by other demonstrators. In a tweet, Michal Szczerba, an opposition MP, said five people with a banner reading “nationalism is not patriotism” were “surrounded and detained” by police on Friday “without a legal basis”. Police said they had “grounds” for detaining the protestors. The arrests occurred during a yearly far-right-led Independence March in Warsaw, Poland’s capital. Organised by nationalist groups, the e…