Glasgow City Council said it would "no longer be requiring the services" of Liam O'Hare after claims he branded Tories "scum" and took part in a demonstration against Ukip last year.
Mr O'Hare has been employed as a youth engagement worker under the banner of the London-based Bite The Ballot group, which encourages voter registration. Bite The Ballot said it was reviewing whether Mr O'Hare would still be working under its banner, adding it was still not aware "of all the facts".
He has been officially employed by a cross-council body called the Renfrewshire Joint Valuation Board, which includes Renfrewshire, East Renfrewshire and Inverclyde Councils and worked one day a week for Glasgow.
One newspaper yesterday reported Mr O'Hare's Facebook page included comments about the Union flag as "that blood-stained imperialist flag", as well as inappropriate language about David Cameron and the police.