Please capitalize where necessary: how did it happen that these persons were branded as enemies of the people and liquidated?
A: How did it happen that these persons were branded as enemies of the people and liquidated?

Please capitalize where necessary: the new directive, which amends appendix 1 of the directive 2002/32/ec, establishes maximum levels for dioxin-like pcbs and indicator pcbs, adjusts the existing action levels for dioxins, and introduces action levels for dioxin-like pcbs.
A: The new Directive, which amends Appendix 1 of the Directive 2002/32/EC, establishes maximum levels for dioxin-like PCBs and indicator PCBs, adjusts the existing action levels for dioxins, and introduces action levels for dioxin-like PCBs.

Please capitalize where necessary: product description and specifications are based on information sites of manufacturers. supplied specifications and appearance lawnmowers gianni ferrari gtr 200 are subject to change without notice.
A: Product description and specifications are based on information sites of manufacturers. Supplied specifications and appearance lawnmowers Gianni Ferrari GTR 200 are subject to change without notice.

Please capitalize where necessary: determining factors for quickness are the reaction speed, quickness (accelerating power) and quickness endurance.
A:
Determining factors for quickness are the reaction speed, quickness (accelerating power) and quickness endurance.