Bahraini firms have laid off hundreds of employees who took industrial action in support of civil rights last month, including many trade unionists.
The General Federation of Bahrain Trade Unions (GFBTU) and the opposition Wefaq group reported on Tuesday that over 200 employees of Batelco, Gulf Air, Bahrain Airport Services and APM Terminals Bahrain have been sacked for participating in the strikes.
The GFBTU launched industrial action on February 20 and again from March 13-22 after the government imposed martial law and invited Saudi and United Arab Emirates troops into the country to crush street protests demanding reforms to boost citizens' rights and restrict the powers of the ruling Khalifa family.
On Monday the International Trade Union Confederation issued a statement condemning Bahraini authorities for penalising workers simply for exercising their legitimate rights to strike and to freedom of expression and assembly.
Bahrain has detained over 300 opposition activists since last month's crackdown.