Speaking in October last year, Bridge, from Bromsgrove in Worcestershire, said the idea behind Raise The Colours was to show pride and unity in “a multi-faith, multi-religion, multicultural country”.
But it prompted people in areas including Stirchley and Moseley to remove them as some opposing activists stated the flags had been hijacked by far-right groups promoting anti-immigrant and racist sentiments.
In June, Bridge was among four activists who agreed not to put up flags on lampposts in Oxfordshire after the county council brought legal action to stop people raising flags near highways.
On Wednesday, Birmingham City Council said its injunction would prevent “unauthorised attachments on the highway, including flags, banners and signage”.
“Community engagement will continue alongside the legal process,” it added.
In a statement, councillor Jane Baston, cabinet member for equalities, communities and social justice, said: “The council is taking a lawful, proportionate and evidence-led approach to unauthorised attachments on the highway.
“This includes pursuing injunctive action based on the evidence gathered to date.
“Our priority is to protect public safety, staff and contractor welfare, community cohesion and the responsible use of public funds.
“We ask residents and community groups to support this approach and to ensure any displays are placed only where permission exists.”