Pearson Longman, Longman Exams Dictionary, grammar guide: It is possible to use would in both clauses in US English but not in British English: US: The blockades wouldn't happen if the police would be firmer with the strikers.
Pearson Longman, Longman Exams Dictionary, справочник по грамматике: Использование would в обоих придаточных возможно в американском английском, но не в британском: США: The blockades wouldn’t happen if the police would be firmer with the strikers.