And 2018 is shaping up to be no different.
The Saftu protests coincide with the ongoing bus strike in South Africa that has affected commuters since April 18.
While it is unclear how many workers will take part, Saftu is believed to have about 800 000 members nationally.
In Durban: Protesters will march to the Durban City Hall, the department of labour and the offices of the premier and the mayor. "We will sit in Port Elizabeth until they fall".
The government's spokeswoman Phumla Williams in a statement called for the workers to stage peaceful protest. It is also demanding the scrapping of proposed changes to labour laws, which will make it more hard to strike.
The strike will negatively affect the metal, steel and engineering sectors where Numsa has most of its members. "If one were to assume a total industry shut down, the direct contribution of the sector to GDP will decline by approximately R17-million per day, or indirectly by roughly R40-million per day".
Saftu's position comes as other labour federations including Cosatu and the Federation of Unions of SA (Fedusa), celebrated the new laws, hailing the national minimum wage as the most progressive labour policy in post-democratic SA. The union federation said it expected to bring industries to a standstill.
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Escamilla was allowed a brief moment to say goodbye to his family before being escorted away to begin his sentence. Saenz told The Brownsville Herald that "if it wasn't so serious, you'd think it was a "Saturday Night Live" skit".
Dissatisfaction over the minimum wage bill could delay implementation.
They are marching to take action to end the country's crisis of unemployment, poverty and inequality in terms of the national minimum wage and certain amendments to the labour laws.
The minimum for farm workers will be R18, R15 for domestic workers and R11 for workers employed by the Extended Public Works programme.
"The federation is, however, very concerned that she added that the suggested minimum R20 per hour amount in the NMW Bill was a starting figure that would be reviewed yearly".
Trade union federation Cosatu has also distanced itself from the planned demonstrations. An offer of 8% for the first year, and 8.5% in the second year, has been rejected and workers are instead proposing a 9.5% increase in the first year and 9% in the next. They initially demanded 12%, while employers offered 7%.
"We are forging ahead with the mass mobilisation of workers on 25 April".
Further on strike action.