Ключевые слова: abstract, action, background, banner, card, celebrate, celebration, communist, confederation, country, day, demonstration, europe, event, flag, flower, general, geral, happy, holiday, illustration, industry, international, label, labor, labour, march, may, may day, movement, national, oporto, party, people, porto, portugal, portuguese, poster, protest, quarteira, socialist, style, text, trabalhadores, typography, union, victory, white, woman, workers,