You could easily argue they both did and do. Raw materials (see Cobalt mining in DRC as example) for semiconductors are tracible to mines throughout central Africa and South America that use child slave labor. Visa/Mastercard uses computers, which have semiconductors, which use slave labor as seen above, so they too use slave labor. It just depends how far you want to set the scope of the argument but you could easily trace all companies in all developed countries to slave labor arguments similar to the above.